Failing to prepare is preparing to fail.
A gifted player, who is not a team player, will ultimately hurt the team.
A coach is someone who can give correction without causing resentment.
Be quick, but don't hurry.
When it's over and you look in the mirror, did you do the best you were capable of? If yes, you will probably be ok with the outcome
A coach's primary function should be not to make better players, but to make better people