The Lord gave Moses and Aaron further instructions in regard to strangers and servants desiring to keep the Passover, that all males must be circumcised. This is why circumcision was such a hot topic in the early church discussion in regards to expectations placed upon gentile believers.
And when a stranger dwells with you and wants to keep the Passover to the Lord, let all his males be circumcised, and then let him come near and keep it; and he shall be as a native of the land. For no uncircumcised person shall eat it. Exodus 12:48.
Paul resolved the issue: for he is not a Jew which is one outwardly, nor is circumcision that is outward in the flesh. 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 2:28 & 29.
Note the clear symmetry between the two verses right up to “in the spirit and not in the letter”. But then Paul adds this final clarification; whose praise is not of men, but of God.
When our heart is circumcised, we can say like Paul:
For do I now persuade men or God? Or do I seek to please men? For if I yet pleased men, I should not be the servant of Christ. Galatians 1:10.
But as we were allowed of God to be put in trust with the gospel, even so we speak; not as pleasing men but God, which tries our hearts. 1 Thessalonians 2:4.
Some translations change this to “God, who tries our hearts.” Granted, He certainly does try us, but the point Paul is making is that the test of a circumcised heart is to put ourselves to this question, am I pleasing men or God. This is the issue which tries our hearts.
Twice Paul makes an interesting statement in 1 Co 1:31 and 2 Co 10:17, “let them that glory, glory in the Lord.” The statement suggests that he is quoting a verse from the Old Testament. In actuality, he is paraphrasing a passage from the prophet Jeremiah. Paul is attempting to remind them of instructions he gave while he was with them.
Paul’s stay in Corinth is chronicled in Acts 18. He reasoned in the synagogue every Sabbath and persuaded the Jews and the Greeks…then he continued there for 18 months! “teaching the Word of God among them”. v.11.
So let’s look at the text from Jeremiah that Paul would have been teaching from to apply this paraphrase he uses “to glory in the Lord.”
Thus saith the Lord, let not the wise glory in his wisdom, neither let the mighty glory in his might, let not the rich glory in his riches: but let him that glories glory in this, that he understands and knows me, that I am the Lord which exercise loving-kindness, judgment and righteousness in the earth; for in these things I delight, saith the Lord. Jeremiah 9:23 & 24.
Now let’s jump back over to 1 Corinthians: for you see your calling brethren how that not many wise men after the flesh, not many mighty, not many noble are called; but God has chosen the foolish things of the world to confound the wise, and God has chosen the weak things of the world to confound the things which are mighty, and base things of the world and things which are despised God has chosen, yes and the things which are not to bring to naught things that are; that no flesh shall glory in His presence. 1 Corinthians 1:26-29.
Try to set aside the obvious inference that the church is made up of foolish, weak, base and despised members and hear the echo of Jeremiah 9 in this passage. So what was Paul teaching on by using Jeremiah 9 as his text? Let’s continue through the final two verses:
Behold, the days come says the Lord, that I will punish all of them which are circumcised with the uncircumcised, and all that are in the utmost corners, that dwell in the wilderness: for all these nations are uncircumcised, and all the house of Israel are uncircumcised in the heart. Jeremiah 9:25&26.
In the time of Jeremiah, all the people of Israel had become blind to God’s Word. Even as Paul wrote to the Corinthians:
For unto this day when Moses is read, the veil is upon their heart. Nevertheless when it (the heart) shall turn to the Lord, the veil shall be taken away. Now the Lord is that Spirit, and where the Spirit of the Lord is, there is liberty. 2 Corinthians 3:15-17.
The blindness of the uncircumcised heart is a paramount issue. For the Lord has set a day when the veil will be lifted from the hearts of Israel. This an opportunity to look at the first of the mysteries of God revealed in Christ that Paul speaks of:
Let a man so account of us as ministers of Christ, and stewards of the mysteries of God. Moreover, it is required in stewards that a man be found faithful. 1 Corinthians 4:1&2
In order to be a faithful steward, a saint must know what these mysteries are of which Paul speaks.
For I would not brethren that you should be ignorant of this mystery, less you should be wise in your own conceits, that blindness in part has happened to Israel, until the fullness of the Gentiles be come in. Romans 11:25.