A man who is truly humble is ...

A man who is truly humble is not troubled when he is wronged and he says nothing to justify himself against the injustice, but he accepts slander as truth; he does not attempt to persuade men that he is calumniated, but he begs forgiveness.
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 Isaac of Nineveh

Quotes from the same author

Whoever hates his sins will stop sinning; and whoever confesses them will receive remission. A man can not abandon the habit of sin if he does not first gain enmity toward sin, nor can he receive remission of sin without confession of sin. For the confession of sin is the cause of true humility.
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 Isaac of Nineveh
Love is the fruit of prayer ... Patiently abiding in prayer signifies a man's renunciation of himself. Therefore the self-denial of the soul turns into love for God.
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 Isaac of Nineveh
Whoever 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.
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 Isaac of Nineveh
The prayer of one who does not consider himself a sinner is not accepted by the Lord.
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 Isaac of Nineveh
The man who follows Christ in solitary mourning is greater than he who praises Christ amid the congregation of men.
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 Isaac of Nineveh