Henry P. Liddon, quoted in Spurgeon’s Treasury of David on Psalm 63
[Of the phrase ‘O God, thou art my God’, particularly the word ‘my’]
�The word represents not a human impression, or desire, or conceit, but an aspect, a truth, a necessity of the divine nature. Man can, indeed, give himself by halves; he can bestow a little of his thought, of his heart, of his endeavour upon his brother man. In other words, man can be imperfect in his acts as he is imperfect and finite in his nature. But when God, the Perfect Being, loves the creature of his hand, he cannot thus divide his love. He must perforce love with the whole directness and strength and intensity of his Being; for He is God, and therefore incapable of partial and imperfect action. He must give Himself to the single soul with as absolute a completeness as if there were no other being besides it, and, on his side, man knows that this gift of himself by God is thus entire; and in no narrow spirit of ambitious egotism, but as grasping and representing the literal fact, he cries �My God.� (�) Therefore we find St. Paul writing to the Galatians as if his own single soul had been redeemed by the sacrifice of Calvary: �He loved me, and gave himself for me.��