Romans 12:16 — Be of the same mind one toward another. Mind not high things, but condescend to men of low estate. Be not wise in your own conceits.
This is a continuation of the thought in the previous verses — literally "minding the same thing one toward another."
high things — objects of pride that cause selfishness and promote self-esteem.
condescend = let ones self be carried along with
low estate = humility, in the sense of humbleness
Philippians 2:4 — Look not every man on his own things, but every man also on the things of others.
Proverbs 26:12 — Seest thou a man wise in his own conceit? there is more hope of a fool than of him.