Mistakes are miscalculations that we should not fear making. None of us have all of the answers all of the time. But we continue to put tremendous pressure on ourselves to be perfect.
Perfection is a trap.
It sets you up for the situation that anything short of it is unacceptable. Perfection is also a weapon that can be used by you and against you. For a brief moment, it is obtainable, until the next mistake. A baseball team strives to win the most games in a season. If it wins miraculously all its games that season the team is then set up to duplicate the feat next year.