Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God.
The new birth is necessary. Why? When we consider the substance within us that is without Christ it is totally susceptible to the temptations of the enemy. Without salvation our soul is not prepared for what is to come when this vapor of life is over.
 Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
We had to be born again from sin and brought into a new life everlasting. We are made into a new creature through Christ, leaving the nature and failures/mistakes of the old creature behind. We no longer have to look at the past with regret and fear; for we have been forgiven and have overcome with the blood of Christ and the spirit of God!
 But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name:
If there is no spiritual birth through Jesus Christ there can be no spiritual life through the Holy Ghost.
 In this was manifested the love of God toward us, because that God sent his only begotten Son into the world, that we might live through him.
Life is only come through God’s manifest of the Holy Spirit! Without it our natural lifesource within our bodies will fail and will come short.
 As newborn babes, desire the sincere milk of the word, that ye may grow thereby:
If there is no life there can be no growth.
 Till we all come in the unity of the faith, and of the knowledge of the Son of God, unto a perfect man, unto the measure of the stature of the fulness of Christ:
Without growth there can be no perfection (maturity) through our trials.
 Because the creature itself also shall be delivered from the bondage of corruption into the glorious liberty of the children of God.
If there is no maturity there can be no liberty in the anointing of the spirit!
 For ye have not received the spirit of bondage again to fear; but ye have received the Spirit of adoption, whereby we cry, Abba, Father.
 The Spirit itself beareth witness with our spirit, that we are the children of God:
 And if children, then heirs; heirs of God, and joint-heirs with Christ; if so be that we suffer with him, that we may be also glorified together.
With no liberty we are not able to hold the inheritance of maturity through sanctification of the spirit on a consistent basis.
In other words…same old trial ups and downs, etc.
Without using the opportunities in our lives to grow by surrendering to God in the hard times we will find defeat in repetition.