This is the mark of Christianity--however much a man toils, and
however many righteousnesses he performs, to feel that he has done
nothing, and in fasting to say, "This is not fasting," and in
praying, "This is not prayer," and in perseverance at prayer, "I
have shown no perseverance; I am only just beginning to practice
and to take pains"; and even if he is righteous before God, he
should say, "I am not righteous, not I; I do not take pains, but
only make a beginning every day."

St. Macarius the Great