Take heed that you give not your alms before men, to be seen of them: otherwise you have no reward of your Father who is in heaven.
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John Chrysostom
AD 407
Hom. xix: Yet be it known that the desire of fame is near a kin to virtue.
For when any thing truly glorious is done, there ostentation has its readiest occasion; so the Lord first shuts out all intention of seeking glory; as He knows that this is of all fleshly vices the most dangerous to man. The servants of the Devil are tormented by all kinds of vices; but it is the desire of empty glory that torments the servants of the Lord more than the servants of the Devil.
And therefore he enjoins this to be more carefully avoided, “Take heed that yedo not your righteousness before men.” It is our heart we must watch, for it is an invisible serpent that we have to guard against, which secretly enters in and seduces; but if the heart be pure into which the enemy has succeeded in entering in, the righteous man soon feels that he is prompted by a strange spirit; but if his heart were full of wickedness, he does not readily perceive the suggestion of the Devil, and therefore He first taught us, “Be not angry, Lust not,” for that he who is under the yoke of these evils cannot attend to his own heart. But how can it be that we should not do our alms before men. Or if this may be, how can they be so done that we should not know of it. For if a poor man come before us in the presence of any one, how shall we be able to give him alms in secret? If we lead him aside, it must be seen that we shall give him. Observe then that He said not simply, “Do not before men,” but added, “to be seen of them.” He then who does righteousness not from this motive, even if he does it before the eyes of men, is not to be thought to be herein condemned; for he who does any thing for God’s sake, sees nothing in his heart but God, for whose sake he does it; as a workman has always before his eyes him who has entrusted him with the work to do.
What shall you receive from God, who have given God nothing? What is done for God's sake is given to God, and received by Him; but what is done because of men is cast to the winds. But that wisdom is it, to bestow our goods, to reap empty words, and to have despised the reward of God? Nay you deceive the very man for whose good word you look; for he thinks you do it for God’s sake, otherwise he would rather reproach then command you. Yet must we think him only to have done his work because of men, who does it with his whole will and intention governed by the thought of them. But if an idle thought, seeking to be seen of men, mount up in any one’s heart, but is resisted by the understanding spirit, he is not thereupon to be condemned of man-pleasing; for that the thought came to him was the passion of the flesh, what he chose was the judgment of his soul.