Rom 4:14 For if it is the adherents of the law who are to be the heirs, faith is null and the promise is void.
1Cor 1:17 For Christ did not send me to baptize but to preach the gospel, and not with words of eloquent wisdom, lest the cross of Christ be emptied of its power.

1Cor 9:15 But I have made no use of any of these rights, nor am I writing these things to secure any such provision. For I would rather die than have anyone deprive me of my ground for boasting.
2Cor 9:3 But I am sending the brothers so that our boasting about you may not prove empty in this matter, so that you may be ready, as I said you would be.
Phili 2:7 but emptied himself, by taking the form of a servant, being born in the likeness of men.
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