"...as he thinketh in his heart, so [is] he..." [Proverbs 23:7]

I don't think this verse has been interpreted (nor, thus, applied) correctly. Some have made it quite psychologically (dianetically/Christian-scientifically) charged. It belongs, I think, with verses such as Matthew 15:8 and 1 Samuel 16:7. Like these others, it's an indictment of dishonesty. That is, his inward thoughts are honest, not necessarily his outward. Integrity is when the inward heart-thinking and the outward-display are 'integrated.' Lack of this is what the Lord opposes--and what, I believe, this verse is all about.

just a thought.