The first mention in the bible of Circumcision is in regards to Abraham. The circumcision that God instructed him to do was called a "Token,"
Genesis 17:11 And ye shall
circumcise the flesh of your foreskin; and it shall be a
token of the covenant betwixt me and you.
It was a foreshadow of things to come.
It directly has to do with Christ on our hearts and minds, and being made whole in HIM.
Jesus spoke about this when the Pharisees were angry because he healed a man.
John 7:23 If a man on the sabbath day receive circumcision, that the law of Moses should not be broken; are ye angry at me, because I have made a man every whit whole on the sabbath day?
A sinner knows that he has need of a savoir, Jesus refers to the sinner as being sick.
Mark 2:17 When Jesus heard it, he saith unto them, They that are whole have no need of the physician, but they that are sick: I came not to call the righteous, but sinners to repentance.
In Christ we are made new, he mends us, molds us and refines us. The bible has a lot to say on these things.
Jesus told the disciples this:
John 16:12 I have yet many things to say unto you, but ye cannot bear them now.
John 16:13
Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come.
This shows the need of Christ leading us and guiding us, and the process of our walk in HIM. When we believe and are baptized in the Spirit, we know only one thing without a doubt, that JESUS is the Savior and redeemer, HE is the way the truth and the life, He came into this world, walked with men, taught the truth, shed HIS blood on the cross and rose again the third day.
From that point, HE grows us and matures us and HE teaches us, HE gave us instruction in the written word on how this is done, and it all goes into seeking, knocking and asking HIM to show us, lead us, guide us and teach us. To change our hearts and to renew us.
Psalms 119:9 Wherewithal shall a young man cleanse his way? by taking heed thereto according to thy word.
We can hear people say all kinds of things, sometimes very profound things, but unless we take it to Christ first and ask HIM and search it out praying for true understanding we just grasp a concept. When Christ reveals His truth to us through our searching and seeking HIS truth with our whole heart. There's no mistaking it when HE reveals it to us, and it brings about a change in us.
John 6:63 It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.
John 7:38 He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water.
It's not about trusting in our own strength or our own might or even our own understanding, but by having faith in HIS power. It's not about trusting in the flesh but trusting in HIM.
Zechariah 4:6 Then he answered and spake unto me, saying, This is the word of the LORD unto Zerubbabel, saying, Not by might, nor by power, but by my spirit, saith the LORD of hosts.
Proverbs 30:5 Every word of God is pure: he is a shield unto them that put their trust in him.
Matthew 4:4 But he answered and said, It is written, Man shall not live by bread alone, but by every word that proceedeth out of the mouth of God.