In this passage, three characteristics are outlined that all flow from having a humble spirit. We are to live in harmony with other Christians, being of one mind with scripture anchoring our worldview. This means we are patient and have a charitable spirit with one another. Harmony doesn't simply mean peace, where cheap grace is given with no repentance or obedience required, but instead means to stand for the truth of scripture in love.
We must be humble toward others, not look down on them, have little patience, or take advantage of weaknesses. Who we are, and the gifts/talents that we have don't come from something within our flesh but are given to us by God.
Lastly, we are not to be wise in our own eyes. Our attitude should not be one of promoting or exalting ourselves or living a life based simply on how we feel, which is commonplace in the world. For the Christian, our wisdom comes from the Lord and his Word, and we ought to be fair in assessing our gifts, talents, and abilities as we seek to serve the Lord.
Scripture: Proverbs 3:1-8, 13-18, Romans 12:9-16