Proverbs 22:6 ... Train up a child in the way he should go: and when he is old, he will not depart from it.
Proverbs 4:23 ... Keep thy heart with all diligence; for out of it are the issues of life.
Proverbs 23:17 ... Let not thine heart envy sinners: but be thou in the fear of the LORD all the day long.