Sayings of The Holy Fathers on Humility:

Paul writes, 'I know of nothing against myself, yet I am not justified by this' (1 Cor. 4:4). You see he does not exalt himself, but humbles and abases himself in every way, and that just when he had reached the summit. And the Three Children were in the fire, in the midst of the furnace, and what did they say? 'For we have sinned and transgressed by departing from You; and we have done evil in every way' (Dan. 3:29). This is what it is to have a contrite heart.

St. John Chrysostom

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...true humility does not say humble words, nor does it assume humble looks, it does not force oneself either to think humbly of oneself, or to abuse oneself in self-belittlement. Although all such things are the beginning, the manifestations and the various aspects of humility, humility itself is grace, given from above. There are two kinds of humility, as the holy fathers teach: to deem oneself the lowest of all beings and to ascribe to God all one's good actions. The first is the beginning, the second the end.

St. Gregory of Sinai
(Texts on Commandments and Dogmas no. 115)

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Abba Anthony said, "I saw the snares the the enemy spreads out over the world and I said groaning, "What can escape from such snares?" Then I heard a voice saying to me, "Humility."

St. Anthony the Great