Proverbs 23:7

As a man thinks in his heart, so is he.

Romans 12:2

Do not conform to the pattern of this world, but be transformed by the renewing of your mind. Then you will be able to test and approve what God’s will is — his good, pleasing and perfect will.

Isaiah 26:3

You will keep in perfect peace those whose minds are steadfast, because they trust in you.

Psalm 119:11

I have hidden your word in my heart that I might not sin against you.