Vs 3: Roll your works upon the Lord [commit and trust them wholly to Him; He will cause your thoughts to become agreeable to His will, and] so shall your plans be established and succeed.
I love the Amplified version. It really fills a scripture out. This verse tells me if I commit what I do, genuinely and completely to Him, He will cause what I am thinking to line up with His will. That is awesome! This should give us a sense of peace that as we strive to seek God in all we do and commit all we have to Him, we will start thinking in accordance with His will.
Consider Vs 9 with this scripture: A man's mind plans his way, but the Lord directs his steps and makes them sure.
We have to trust God with everything. He has only our best interests at heart.
Vs 6: By mercy and love, truth and fidelity [to God and man - not by sacrificial offerings], iniquity is purged out of the heart, and by reverent, worshipful fear of the Lord men depart from and avoid evil.
This tells me that if we are merciful to others, if we show love, are truthful to God and man, our sinful natures will be changed, our hearts cleansed. All this, by the reverent and worshipful fear (Godly respect) of the Lord. And we will turn from and avoid evil.
And finally, vs 32: He who is slow to anger is better than the mighty, he who rules his own spirit than he who takes a city.
I don't think a person's desire is to be 'better' than the mighty or 'better' than someone who takes a city - but - God says when we control our tempers, we are.
My encouragement to you - bite your tongue - no, only joking! Immerse yourself in God's word, for from it springs life.