Proverbs 4: 

²⁰ My son, pay attention to what I say;
       listen closely to my words.

 ²¹ Do not let them out of your sight,
       keep them within your heart;

 ²² for they are life to those who find them
       and health to a man’s whole body.

 ²³ Above all else, guard your heart,
       for it is the wellspring of life.