What is the good of the fasts and watchings which a man imposes on himself?
St Moses was asked, ‘What is the good of the fasts and watchings which a man imposes on himself?’ and he replied, ‘They make the soul humble.
For it is written, "Consider my affliction and my trouble, and forgive all my sins." (Ps.25.18) So if the soul gives itself all this hardship, God will have mercy on it.’