Whoever prematurely begins a work that is above his strength receives nothing, but only brings harm upon himself.
Isaac of NinevehWhoever can weep over himself for one hour is greater than the one who is able to teach the whole world; whoever recognizes the depth of his own frailty is greater than the one who sees visions of angels.
Isaac of NinevehIf you practice an excellent virtue without perceiving the taste of its aid, do not marvel; for until a man becomes humble, he will not receive a reward for his labor. Recompense is given, not for labor, but for humility.
Isaac of NinevehIf, at the time when the mind is praying it is distracted by any extraneous thought or worry about anything, then this prayer is not called pure.
Isaac of NinevehLet there always be a preponderance of mercy with you, even though you don't feel such mercy in yourself, as God has for the world ... A cruel and merciless heart is never purified. A merciful man is the doctor of his own soul, because as it were a by a strong wind from is heart he drives out the darkness of the passions.
Isaac of NinevehIt is impossible to draw near to God without sorrows, without which human righteousness cannot remain unchanged... If you desire virtue, than give yourself to every affliction, for afflictions produce humility. If someone abides in virtue without afflictions, the door of pride is opened to him.
Isaac of Nineveh