παροιμία (paroimia, 3942), -ας, ἡ, (παρά by, aside from [cf. παρά, IV. 2], and οἶμος way), prop. a saying out of the usual course or deviating from the usual manner of speaking [cf. Suidas 654, 15; but Hesych. s. v. et al. “a saying heard by the wayside” (παρά, IV. 1), i. e. a current or trite saying, proverb; cf. Curtius §611; Steph. Thes. s. v.], hence
1. a clever and sententious saying, a proverb, (Aeschyl. Ag. 264; Soph., Plat., Aristot., Plut., al.; exx. fr. Philo are given by Hilgenfeld, Die Evangelien, p. 292 sq. [as de ebriet. § 20; de Abr. § 40; de vit. Moys. i. § 28; ii. § 5; de exsecrat. § 6]; for מָשָׁל in Prov. i. 1; xxv. 1 cod. Alex.; Sir. vi. 35, etc.): τὸ τῆς παροιμίας, what is in the proverb (Lcian. dial. mort. 6, 2; 8, 1), 2 Pet. ii. 22.
2. any dark saying which shadows forth some didactic truth, esp. a symbolic or figurative saying: παροιμίαν λέγειν, Jn. xvi. 29; ἐν παροιμίαις λαλεῖν, ibid. 25; speech or discourse in which a thing is illustrated by the use of similes and comparisons; an allegory, i. e. extended and elaborate metaphor: Jn. x. 6.*

(Parable?)of the Good Shepherd

1"Truly, truly, I say to you, he who does not enter by the door into the fold of the sheep, but climbs up some other way, he is a thief and a robber. 2"But he who enters by the door is a shepherd of the sheep. 3"To him the doorkeeper opens, and the sheep hear his voice, and he calls his own sheep by name and leads them out. 4"When he puts forth all his own, he goes ahead of them, and the sheep follow him because they know his voice. 5"A stranger they simply will not follow, but will flee from him, because they do not know the voice of strangers." 6This figure of speech Jesus spoke to them, but they did not understand what those things were which He had been saying to them. 7So Jesus said to them again, "Truly, truly, I say to you, I am the door of the sheep. 8"All who came before Me are thieves and robbers, but the sheep did not hear them. 9"I am the door; if anyone enters through Me, he will be saved, and will go in and out and find pasture. 10"The thief comes only to steal and kill and destroy; I came that they may have life, and have it abundantly.

The Sheepfold:

Sheepfolds were generally a community affair where shepherds of the community might keep their flock during the night. They were often large enclosures with stone walls with large briars and thorns across the top to make the pen secure and keep the thieves out. These folds were protected by a strong door and a porter (the door keeper) was either paid or was one of the Sheepherders. The porter knew whose sheep belonged to who and would open the door for the owners. The real owners or shepherds knew their sheep because the sheep would follow them into the fold and also out of the fold. It was not hard to tell who owned the sheep. Therefore, the real owners of the sheep came through the door (Jesus) and the sheep "followed" them. Anyone who tried to enter the sheepfold by some other means is a thief and a robber.

11"I am the good shepherd; the good shepherd lays down His life for the sheep. 12"He who is a hired hand, and not a shepherd, who is not the owner of the sheep, sees the wolf coming, and leaves the sheep and flees, and the wolf snatches them and scatters them. 13"He flees because he is a hired hand and is not concerned about the sheep. 14"I am the good shepherd, and I know My own and My own know Me, 15even as the Father knows Me and I know the Father; and I lay down My life for the sheep. 16"I have other sheep, which are not of this fold; I must bring them also, and they will hear My voice; and they will become one flock with one shepherd. 17"For this reason the Father loves Me, because I lay down My life so that I may take it again. 18"No one has taken it away from Me, but I lay it down on My own initiative I have authority to lay it down, and I have authority to take it up again This commandment I received from My Father." 19A division occurred again among the Jews because of these words. 20Many of them were saying, "He has a demon and is insane. Why do you listen to Him?" 21Others were saying, "These are not the sayings of one demon-possessed A demon cannot open the eyes of the blind, can he?"

Jesus Asserts His Deity

22At that time the Feast of the Dedication took place at Jerusalem; 23it was winter, and Jesus was walking in the temple in the portico of Solomon. 24The Jews then gathered around Him, and were saying to Him, "How long will You keep us in suspense? If You are the Christ, tell us plainly." 25Jesus answered them, "I told you, and you do not believe; the works that I do in My Father's name, these testify of Me. 26"But you do not believe because you are not of My sheep.27"My sheep hear My voice, and I know them, and they follow Me; 28and I give eternal life to them, and they will never perish; and no one will snatch them out of My hand. 29"My Father, who has given them to Me, is greater than all; and no one is able to snatch them out of the Father's hand. 30"I and the Father are one." 31The Jews picked up stones again to stone Him.

Verses 28-29 are probably the most misused verses in the entire by different Calvanist groups and is often the proof text for their
"once saved always saved" doctrine. It is actually the Roman Catholic doctrines of Augustine known as eternal security. The entire
doctrine rests on a mis-use of the biblical texts. We must remember that this was before the church was established and during the ministry of Jesus and his disciples who were later to be called apostles.  In this context, Jesus is speaking to Jews (not us) who are not His disciples. In the first part of this chapter He was speaking to His disciples as "His Sheep." The disciples of Christ had
their mission to fulfill as we see in Acts the 2nd chapter,  just as Jesus had his mission to complete. It was those disciples (not us) that no one could snatch from Him since their job was not completed.  In John 21:18, Jesus even tells Peter how he will die in the service of the Lord. Once again, in John chapter 10 the sheep in specific that no one can snatch from Jesus are the disciples who were to be responsible for establising the church after Jesus was gone.  The conversation continues in John 17:12 where Jesus tells the Father that these men were given to Him by the Father and He has not lost a one of them. In 18:8 when Jesus was arrested, He once
again made sure that His disciples were not harmed. The disciples like Jesus had their mission on earth and no one could snatch them from Jesus until the appointed time.   

Verses 28-29 are often used for the unscriptual doctrine of once in grace always in grace. This "doctrine" is known in the denominational world as"once saved always saved." As Wescott correctly states. "If a man falls at any stage in his spiritual life, it is not from want of divine grace, nor from the overwhelming power of the adversaries but from the neglect to use that which he may or may not use. We cannot be protected from ourselves....

No matter what John Calvin  taught, the Bible teaches something entirely different. One can fall from Grace (Galatians 5:4). (See the Myth of Calvinsim and other forms of Popery here)

A Brief look at Perseverance of the Saints (Once saved always saved).

Once saved always saved is simply a logical result of accepting the tenants of Calvinism.  If one believes that they were born totally depraved, which leads to predestination, since the the only way any depraved person can be saved is to be predestined, which leads to limited atonement which leads to irresistible grace. After one has been through the above process, of course it is impossible to be lost, if you believe the above.

Once saved always saved must be evaluated in light of the teaching of the Bible. The Bible claims that a believer can be “shipwrecked” (I Timothy 1:19), they can “shrink back” (Hebrews 2:1). They can “fall away” Luke 8:13), or be “disqualified” (Ist Corinthians 9:27). But there are other variations of the same doctrine.

(1). Once in Grace, Always in Grace

The Bible teaches that you can fall from Grace (see Galatians 5:4). Peter admonished God's people, “ If you do these things, you will never fall (2 Peter 1:10). The Hebrew writer went further. “See that no one misses the grace of God.” (Hebrews 12:15).

(2) Once a child always a child

While this slogan sounds good on the surface, it is more accurate than the users want it to be. Jesus said “ You belong to your father, the devil (John 8:44). Notice, if the premise is true, no child of the devil can ever be converted the Christ. If once an angel always an angel is true, it did not keep sinning angles from hell (II Peter 2:4).

(3)Once a sheep, always a sheep.

We must remember that the Master Shepherd called the sheep that strayed from the fold 'lost.' (Luke 15:6).

(4) Once in Eternal life, Always in Eternal Life.

The promise of Eternal life is found throughout the Bible. (1^st John 2:25) But it is also called the “hope of eternal life,” (Titus 1:2; 3:7). Jesus taught that after the
judgment, the righteous will go to Eternal life (Matthew 24:46). He insisted that “those who follow Him would be given Eternal life in the age to come.” We must not mistake a future promise for a present possession. “In this hope, we were saved.” Hope that is seen is not hope at all. Hope is for the unseen. Eternal life is a promise for the future, not for the present.

(5) Once in the Book, always in the Book

The words of Moses ought to suffice. “Whoever has sinned against me I will blot out of my book” (Exodus 32:33). The usual response is, “that is from the Old Testament but the new Testament teaches no such thing.” Wrong, The Revelator writes Jesus' promise to the church on conditional terms, “He who overcomes...I will never blot out his name from the book of life.” (Revelation 3:5).

(6) Once in Christ always in Christ

John 15 tells us that God as the gardener “cuts off every branch in me (Jesus) that bears no fruit.” “If anyone does not remain in me, he is like a branch that is thrown away and withers; such branches are picked up, thrown into the fire and burned (V6).

(See Study on Falling from Grace (here)

Complete Studies on Calvinism or Augustin ism (here)It should be noted that the name  "Calvinism is a "misnomer." All of his doctrines are "early Catholicism" developed by Augustine of Hippo. (Here)

32Jesus answered them, "I showed you many good works from the Father; for which of them are you stoning Me?" 33The Jews answered Him, "For a good work we do not stone You, but for blasphemy; and because You, being a man, make Yourself out to be God." 34Jesus answered them, "Has it not been written in your Law, 'I SAID, YOU ARE GODS'? 35"If he called them gods, to whom the word of God came (and the Scripture cannot be broken), 36do you say of Him, whom the Father sanctified and sent into the world, 'You are blaspheming,' because I said, 'I am the Son of God'? 37"If I do not do the works of My Father, do not believe Me; 38but if I do them, though you do not believe Me, believe the works, so that you may know and understand that the Father is in Me, and I in the Father." 39Therefore they were seeking again to seize Him, and He eluded their grasp. 40And He went away again beyond the Jordan to the place where John was first baptizing, and He was staying there. 41Many came to Him and were saying, "While John performed no sign, yet everything John said about this man was true." 42Many believed in Him there. 38but if I do them, though you do not believe Me, believe the works, so that you may know and understand that the Father is in Me, and I in the Father." 39Therefore they were seeking again to seize Him, and He eluded their grasp. 40And He went away again beyond the Jordan to the place where John was first baptizing, and He was staying there. 41Many came to Him and were saying, "While John performed no sign, yet everything John said about this man was true." 42Many believed in Him there.