Let 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 NinevehBehold, for years and generations, the way of God has been leveled by the cross and by death. How is this with thee, that thou seest the afflictions of the way as if they were out of the way? Doest not thou wish to follow the steps of the saints? Or doest thou wish to go a way which is especially for thee, without suffering? the way unto God is a daily cross. No one can ascend unto heaven with comfort, we know where the way of comfort leads.
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 a man does not argue with the thoughts that the enemy secretly sows in us, but by prayer to God uproots conversation with them, this is a sign that his mind has attained wisdom, and that he has found a short path.
Isaac of NinevehWithout temptations, it is not possible to learn the wisdom of the Spirit. It is not possible that Divine love be strengthened in your soul. Before temptations, a man prays to God as a stranger. When temptations are allowed to come by the love of God, and he does not give in to them, then he stands before God as a sincere friend. For in fulfilling the will of God, he has made war on the enemy of God and conquered him.
Isaac of Nineveh