For a wise person, there is no greater joy than that of improving his character traits. When someone reaches this level, he can feel joy even when someone insults him – because he has worked himself free of all animosity and resentment.

Take pleasure every time you: – control yourself from getting angry – are patient with others – overcome your desires – react positively instead of with envy about someone else’s accomplishments.

Sources: see Chazon Ish – Emunah U’bitochon, 4:15; Rabbi Zelig Pliskin’s “Gateway to Happiness,” p.110