And shall not uncircumcision which is by nature, if it fulfil the law, judge thee, who by the letter and circumcision dost transgress the law?(Romans 2:27)

For he is not a Jew, which is one outwardly; neither is that circumcision, which is outward in the flesh:(Romans 2:28)

But he is a Jew, which is one inwardly; and circumcision is that of the heart, in the spirit, and not in the letter; whose praise is not of men, but of God.(Romans 2:29)

What advantage then hath the Jew? or what profit is there of circumcision?

Much every way: chiefly, because that unto them were committed the oracles of God.(Romans 3:2)

For what if some did not believe? shall their unbelief make the faith of God without effect?(Romans 3:3)

God forbid: yea, let God be true, but every man a liar; as it is written, That thou mightest be justified in thy sayings, and mightest overcome when thou art judged.(Romans 3:4)

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If we walk in the things of the Spirit, we will live
In this article, Charles Spurgeon discusses the importance of true circumcision performed by Jehovah God on our hearts, resulting in a love for God that brings life. He emphasizes the need to trust in the Holy Spirits work of grace in our hearts rather than external rituals.

How to reason when we don't know God's will
Discusses the controversy in Acts 15 over whether Gentile converts needed to follow Jewish customs, and the decision-making process of the early church in regards to this issue.

Romans 3:1 - Cross Reference

To what purpose is the multitude of your sacrifices unto me? saith the LORD: I am full of the burnt offerings of rams, and the fat of fed beasts; and I delight not in the blood of bullocks, or of lambs, or of he goats. (Isaiah 1:11)

Ye have said, It is vain to serve God: and what profit is it that we have kept his ordinance, and that we have walked mournfully before the LORD of hosts? (Malachi 3:14)

If after the manner of men I have fought with beasts at Ephesus, what advantageth it me, if the dead rise not? let us eat and drink; for to morrow we die. (1 Corinthians 15:32)

And Esau said, Behold, I am at the point to die: and what profit shall this birthright do to me? (Genesis 25:32)

Seeing there be many things that increase vanity, what is man the better? (Ecclesiastes 6:11)

For circumcision verily profiteth, if thou keep the law: but if thou be a breaker of the law, thy circumcision is made uncircumcision. (Romans 2:25)

For what hath the wise more than the fool? what hath the poor, that knoweth to walk before the living? (Ecclesiastes 6:8)

Be not carried about with divers and strange doctrines. For it is a good thing that the heart be established with grace; not with meats, which have not profited them that have been occupied therein. (Hebrews 13:9)