For the Jews require a sign, and the Greeks seek after wisdom:

But we preach Christ crucified, unto the Jews a stumblingblock, and unto the Greeks foolishness;

But unto them which are called, both Jews and Greeks, Christ the power of God, and the wisdom of God.

Was any man already circumcised when he was called [by God to be a Christian]? Then he should not [try to] become uncircumcised. [Note: Some Jews in that day resorted to a surgical procedure in an attempt to conceal their circumcision]. Was any man uncircumcised when he was called? Then he should not become circumcised.

And unto the Jews I became as a Jew, that I might gain the Jews; to them that are under the law, as under the law, that I might gain them that are under the law;

consider the custom of the Jews by descent, are not they which eat of the sacrifices, partakers of the altar? what say I then?

Give none offence, neither to the Jews, nor to the Gentiles, nor to the church of God:

For by one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit.