Proverbs 4

23 Guard your heart above all else,
  for it determines the course of your life.

24 Avoid all perverse talk;
  stay away from corrupt speech.

25 Look straight ahead,
  and fix your eyes on what lies before you.
26 Mark out a straight path for your feet;
  stay on the safe path.
27 Don't get sidetracked;
  keep your feet from following evil.