Proverbs 23:7

For as he thinketh in his heart, so is he: Eat and drink saith he to thee; but his heart is not with thee.

The Bible says to guard our hearts, for out of it come the issues of life.  What we think in our hearts is how we truly feel.  Our focus then is vital.  We cannot expose our heart to the negative daily and expect it to produce positive thoughts.  We need to train ourselves to turn away from that which doesn’t build us up spiritually.