Integrity is truthfulness. It is doing what you say you will do. Demand it from yourself and reward it in others.
Do right by others, and God will do right by you.
“Judge me, O Lord; for I have walked in mine integrity: I have trusted also in the Lord; therefore I shall not slide.”
“Better is the poor that walketh in his integrity, than he that is perverse in his lips, and is a fool.”