No man in Israel despised himself more than David when the precepts of the Lord were concerned, and this is what he said before God (Ps. cxxxi. 1, 2), " ( Lord, my heart was not haughty } when Samuel anointed me king. Nor were mine eyes lofty > when I slew Goliath. ( Neither did I exercise myself in matters too great and wonderful for me > when I brought up the ark. ( Have I not behaved myself, and hushed my soul, as a babe that is weaned of his mother? As a child which is not ashamed to uncover himself before his mother, so have I likened myself before Thee, in not being ashamed to depreciate myself before Thee for Thy glory, w etc. (See 2 Sam. vi. 20, 21.)
How David Humbled Himself When the Ark Came Home
Bamidbar Rabbah 4