Charles H. Spurgeon on Psalms 70:5

But I am poor and needy. He had been rich, but for our sake he had become poor, that we, through his poverty, might be rich. Out of the fulness of his grace he had voluntarily entered, for our sakes, into a state in which he had experience, and most bitter experience, of the want of the means of enjoyment... But the word here rendered poor is often elsewhere, translated afflicted; in various ways he was afflicted. He was despised and rejected of men, a man of sorrows, and the acquaintance of grief. He was reproached, and "reproach broke his heart." James Frame.