There are those that believe in the manmade doctrine of “once saved always saved.” I do not follow this doctrine for within the book of John, Christ states you can be removed from Him. This implies that you were are one time with Him since you cannot be removed from something you were not a part of. Many follow this doctrine without being aware that they are.
Christ clearly states that one must “abide” with Him.
Abide – 3306. meno men’-o a primary verb; to stay (in a given place, state, relation or expectancy):–abide, continue, dwell, endure, be present, remain, stand, tarry (for), X thine own.
Dwell – 3 a: to keep the attention directed —used with on or upon
b: to speak or write insistently —used with on or upon
Endure – 1: to continue in the same state: last 2: to remain firm under suffering or misfortune without yielding

This means you have to have an active relationship with Jesus. Just going to church on Sunday and then not spend the other 313 days of the year dwelling in Christ and His teaches is not abiding in Him. We are the bride and He is the Groom. Do you spend 52 days out of the year with your wife or husband? If you did, you will soon find yourself divorced.
Your branch must bear fruit and that God Himself will prune you so that in the end you will bear more fruit. I experienced this pruning personally in my year of Job. Now I am dedicated to writing these words in hopes that they shall bear the fruit of God.
I know without a doubt that I came close to being a branch that bore no fruit and knew again, without a doubt, that I was close to being removed from the vine of Christ and gathered up and burned within the fire. The symbolism is clearly stated in these verses by Jesus Himself.
Know Him.
Have an active relationship with Him. This means to be a living example of what He taught and to strive to do so. Not only through prayer, but actions. So you can be a bearer of Godly fruit.
If you do not bear fruit you will be cast off by God and join the world of man and be thrown into the fire.
John 15: 7 If ye abide in me, and my words abide in you, ye shall ask what ye will, and it shall be done unto you.
Words – 4487. rhema hray’-mah from 4483; an utterance (individually, collectively or specially),; by implication, a matter or topic (especially of narration, command or dispute); with a negative naught whatever:–+ evil, + nothing, saying, word.

John 15: 1 I am the true vine, and my Father is the husbandman. 2 Every branch in me that beareth not fruit he taketh away: and every branch that beareth fruit, he purgeth it, that it may bring forth more fruit. 3 Now ye are clean through the word which I have spoken unto you. 4 Abide in me, and I in you. As the branch cannot bear fruit of itself, except it abide in the vine; no more can ye, except ye abide in me.
5 I am the vine, ye are the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing. 6 If a man abide not in me, he is cast forth as a branch, and is withered; and men gather them, and cast them into the fire, and they are burned. 7 If ye abide in me, and my words abide in you, ye shall ask what ye will, and it shall be done unto you. 8 Herein is my Father glorified, that ye bear much fruit; so shall ye be my disciples. 9 As the Father hath loved me, so have I loved you: continue ye in my love. 10 If ye keep my commandments, ye shall abide in my love; even as I have kept my Father’s commandments, and abide in his love. 11 These things have I spoken unto you, that my joy might remain in you, and that your joy might be full.