It’s only those who do nothing that make no mistakes, I suppose.
Joseph Conrad, An Outcast of the Islands (1896), Pt. 3, Ch. 2
Those who do make mistakes, those who do nothing make no progress.
Chi fa falla, e chi non fa sfarfalla.
English translation: Those who act make mistakes; and those who do nothing really blunder.
Good judgment comes from experience. Experience comes from bad judgment.