Based on the context and the answer, generate a question. 

Context: You ca n't . You ca n't . I know that words are powerful , even words spoken silently to ourselves . We build ourselves up or tear ourselves down by what we say . And I know that we are usually our own harshest critic . But sometimes it pays off to step out of that comfort zone and do something a little different , to try something that terrifies .

Answer:

You grow in courage .



Why may it good to step outside one 's comfort zone ?