Zechariah 7:9-10

Thus has the Lord of hosts said, ‘Dispense true justice and practice kindness and compassion, to each other; and do not oppress or exploit the widow or the fatherless, the stranger or the poor; and do not devise or even imagine evil in your hearts against one another.  

The scripture covers all of what can go wrong in a person’s heart unless we keep guard. It may be a battle sometimes, but when we concentrate on what is good in the word of God, our gate remains firmly locked to wrong thinking. Our persistence’s in thinking only good for others will pay off, and strife, anger, and frustration not worth our time.