Musar zu Bereschit 18:17

4. The fourth manifestation of true modesty is if the Creator, Blessed be He, deals well with a man in giving him wealth and children, and also gives him great wisdom, understanding and honor. That man should become even more modest and humble before the Creator, Blessed be He, and honor men and do good to them more than before. As in the case of Abraham when the Holy One, Blessed be He, said to him: "Shall I hide from Abraham what I am about to do, since Abraham is to become a great and populous nation…" (Gen. 18:17-18). Abraham responded, "And I am dust and ashes."