'Unless' in the Bible

unless you can deny that it is one and the same God who will pronounce the circumcised to be acquitted on the ground of faith, and the uncircumcised to be acquitted through the same faith.

What follows? Is the Law itself a sinful thing? No, indeed; on the contrary, unless I had been taught by the Law, I should have known nothing of sin as sin. For instance, I should not have known what covetousness is, if the Law had not repeatedly said, "Thou shalt not covet."

And how are men to preach unless they have been sent to do so? As it is written, "How beautiful are the feet of those who bring glad tidings of good!"