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 NinevehThe beginning of divine wisdom is clemency and gentleness, which arise from greatness of soul and the bearing of infirmities.
Isaac of NinevehThe prayer of one who does not consider himself a sinner is not accepted by the Lord.
Isaac of NinevehDraw nigh to the righteous, and through them you will draw nigh to God. Communicate with those who possess humility, and you will learn morals from them. A man who follows one who loves God becomes rich in the mysteries of God; but he who follows an unrighteous and proud man gets far away from God, and will be hated by his friends.
Isaac of NinevehThere is no man who will not be grieved at the time of his chastisement; and there is not man who will not endure a bitter time, when he must drink the poison of temptations. Without them, it is not possible to obtain a strong will. When he has often experienced the help of God in temptations, a man also obtains strong faith.
Isaac of Nineveh