He who prays with understanding patiently accepts circumstances, whereas he who resents them has not yet attained pure prayer.
("Philokalia (Vol. 1)", p. 118, text 113)
... For patient acceptace of whatever happens kindles the remembrance of God, whereas refusal to accept weakens the spiritual purpose of the heart and so makes it forgetful.
("Philokalia (Vol. 1)", p. 136, text 134)