Luke 18:14
I tell you, this man went back home right with God instead of the other man. For every person who exalts himself [as important] will be humbled, but whoever humbles himself will be exalted [as important]."
Romans 14:23
But the person who has doubts about eating [a certain food] is self-condemned if he [goes ahead and] eats it, because his action is not based on faith [i.e., if he lacks the conviction that he is doing what is right]. And whatever is not done with such a conviction is a sin.
1 Peter 5:5
And in the same way, you younger [Christians] should be [respectfully] submissive to the older ones. And all of you should [be willing to] humbly serve one another, for God stands opposed to [the efforts of] proud people, but extends His unearned favor to those [who serve] with humility.