Charles H. Spurgeon on Psalms 109:22

For I am poor and needy, and my heart is wounded within me. Note here, how beautifully he unites these arguments. He had said, Because Thy mercy is good; and he adds, "Because I am poor and needy." He could not have added anything more appropriate: for this is the nature of goodness and mercy, even in the human heart, much more in God, the best and most merciful of all beings, that nothing more easily moves it to give succour, than the affliction, calamity, and misery of those by whom it is invoked. —Wolfgang Musculus.