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.
Read Chapter 12
To be haughty is pride, which is how the devil fell. … Solomon says that “God resists the proud.” Put pride aside and make other people’s cares your own so that you might be acceptable to God. Commentary on Paul’s Epistles.
Here again Paul insists on humility, which is how he started this whole exhortation. For since there was a probability that the Romans would be high minded because of the greatness of their city and for many other reasons, he keeps drawing off the sickness of pride…. There is nothing so likely to cause schisms in the church as vanity…. If a poor man comes into your house, behave like him and do not put on airs because of your riches. In Christ there is no rich or poor. Do not be ashamed of him because of his outward dress, but receive him because of his inward faith. If you see him in sorrow, do not hesitate to comfort him, and if he is prospering, do not feel shy about sharing in his pleasure…. If you think you are a great person, then think others are also. If you think they are humble and lowly, then think the same of yourself.
Then, fired with a holy zeal, gave themselves up to this, using much boldness, and especially when they saw those who were drawn aside and lapsed, on their account they were roused mightily within, and, as it were by some inward voice, impelled to war down and subdue the adversary who was exulting; for this they earnestly contended, that he might not seem "to be wise in his own conceit"