Jesus said that we should "not live on bread alone, but on every word that comes from the mouth of God." As our bodies are fed by food, so our spirits are fed by words with ideas and images. We are flooded by words that can mislead us, so we need to feed our minds each day from the Word of God.
I often feed my mind by taking a thought from Scripture:
Nothing can separate us from the love of God.
-- I can
do all things through Christ, who strengthens me.
is light, and in Him is no darkness at all.
Try to let your mind feast on the Word of God throughout
-- John Ortberg in God Is Closer Than You Think