Read Proverbs 4:23  Solomon was a great king and a good general of his army.  As a general he was familiar with military words.  Here in verse 23 Solomon uses a military word to begin our verse.  Solomon told his son – and tells us as we read it – to keep his heart.  The word keep means to guard as a military fort would guard the road into the kingdom.  We should be careful and guard the things that enter our hearts.  We should guard what we think about; the music that we listen to; and the TV programs that we watch.  The things that we do become habits: we keep on doing them.  Some habits are good, like brushing your teeth every day.  But some habits are bad like picking your nose.  Yuck!  We should be careful about our hearts and our habits – they will become our life.  Our habits are what we are.  Our hearts are what we love.  Put a fort up!  Guard your habits and your heart!