The prayer of one who does not consider himself a sinner is not accepted by the Lord.
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 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 NinevehWhen you want to direct someone toward the good, first put him at peace bodily and honor him with words of love. For nothing inclines such a man to shame and induces him to cast of his vice and be changed for the better as do bodily goods and honor, which he sees in you. Then, with love tell him a word or two, and do not be inflamed with anger toward him. Do not let him see any cause of enmity toward you. For love does not know how to lose its temper.
Isaac of Nineveh