Take my yoke upon you and learn from me, for I am meek and humble of heart;
and you will find rest for yourselves.
For my yoke is easy, and my burden light.

Matt. 11, 29-30

St. Sister Faustina about humble

(Selected parts of the Diary of St. Faustina Kowalska)

If there is a truly happy soul upon earth, it can only be a truly humble soul. At first, one's self-love suffers greatly on this account, but after a soul has struggled courageously. God grants it much light by which it sees how wretched and full of deception everything is. (...) A humble soul does not trust itself, but places all its confidence in God. God defends the humble soul and lets Himself into its secrets, and the soul abides in unsurpassable happiness which no one can comprehend (Diary 593)

Without humility, we cannot be pleasing to God (Diary 270). He who wants to learn true humility should reflect upon the Passion of Jesus (Diary 267)

O humility, lovely flower, I see how few souls possess you. Is it because you are so beautiful and at the same time so difficult to attain? O yes, it is both the one and the other. (...) The floodgates of heaven are open to a humble soul, and a sea of graces flows down upon her. O how beautiful is a humble soul! (...) God refuses nothing to such a soul; she is all-powerful and influences the destiny of the whole world. God raises such a soul up to His very throne, and the more she humbles herself, the more God stoops down to her, pursuing her with His graces and accompanying her at every moment with His omnipotence. Such a soul is most deeply united with God. (...) Now I understand why there are so few saints; it is because so few souls are deeply humble (Diary 1306)

A soul does not benefit as it should from the sacrament of confession if it is not humble. Pride keeps it in darkness. The soul neither knows how, nor is it willing, to probe with precision the depths of its own misery. It puts on a mask and avoids everything that might bring it recovery. (Diary 113). Satan defeats only the proud and the cowardly, because the humble are strong. Nothing will confuse or frighten a humble soul (Diary 450)

I never cringe before anyone. I can't bear flattery, for humility is nothing but the truth. There is no cringing in true humility (Diary 1502)