It is true that circumcision is of use if you keep the law, but if you go against the law it is as if you had it not.

For we maintain that it is as the result of faith that a man is held to be righteous, apart from actions done in obedience to Law.

so that the promise should be made sure to all Abraham's true descendants; not merely to those who are righteous through the Law, but to those who are righteous through a faith like that of Abraham. Thus in the sight of God in whom he believed, who gives life to the dead and makes reference to things that do not exist, as though they did, Abraham is the forefather of all of us. As it is written, "I have appointed you to be the forefather of many nations."

Now these words were not written simply for his sake, but for us as well.

but for our sakes as well; faith will be counted to us as we believe in Him who raised Jesus our Lord from the dead,

Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death?

And Isaiah says about Israel, Even if the number of the children of Israel is as the sand of the sea, only a small part will get salvation:

It is as Isaiah foretold,

“If the Lord of Hosts had not left us seed [future generations from which a believing remnant of Israelites came],
We would have become like Sodom, and would have resembled Gomorrah [totally rejected and destroyed]!”

For I say, through the grace which has been given to me, to every one that is among you, not to have high thoughts above what he should think; but to think so as to be wise, as God has dealt to each a measure of faith.

So, welcome one another, just as Christ has welcomed you [or, "us"], as a way of honoring God.

For your obedience has reached to all. I rejoice therefore as it regards you; but I wish you to be wise as to that which is good, and simple as to evil.