Behold the proud, his soul is not upright in him; but the just shall live by his faith. (Habakkuk 2:4)
Not another's, but your own faith is sufficient to walk in obedience to the One who has given us our measure of faith. The proud trust in their own understanding and foolishly believe that they are a law unto themselves. Their "faith" is self-imposed; it is a design of their own imaginations. It has no object other than their own pride. The faith of the just is not fabricated, but it is a gift of God. The just, "live by faith in the Son of God." Therefore we must ask ourselves, is my faith a fabricated faith or is it the faith measured to me by God? How can I know the difference? How can I distinguish pride from faith? I believe that answer can be found in another question. In whom do I trust? Am I trusting in my own understanding or am I trusting in God and the understanding He gives? The one glorifies self the other gives glory to God.