Augustine of Hippo
Catena Aurea · Matthäusevangelium 6
Therefore when thou doest thine alms, do not sound a trumpet before thee, as the hypocrites do in the synagogues and in the streets, that they may have glory of men. Verily I say unto you, They have their reward. But when thou doest alms, let not thy left hand know what thy right hand doeth: That thine alms may be in secret: and thy Father which seeth in secret Himself shall reward thee openly.
(ubi sup.) As then the hypocrites, (a word meaning ‘one who feigns,’) as personating the characters of other men, act parts which are not naturally their own—for he who personates Agamemnon, is not really Agamemnon, but feigns to be so—so likewise in the Churches, whosoever in his whole conduct desires to seem what he is not, is a hypocrite; he feigns himself righteous and is not really so, seeing his only motive is praise of men.