“Behold, I have graven thee upon the palms of my hands.”
—Isaiah 49:16

No doubt a part of the wonder which is concentrated in the word “Behold,” is excited by the unbelieving lamentation of the preceding sentence. Zion said, “The Lord hath forsaken me, and my God hath forgotten me.” How amazed the divine mind seems to be at this wicked unbelief! What can be more astounding than the unfounded doubts and fears of God’s favoured people? The Lord’s loving word of rebuke should make us blush; he cries, “How can I have forgotten thee, when I have graven thee upon the palms of my hands? How darest thou doubt my constant remembrance, when the memorial is set upon my very flesh?” O unbelief, how strange a marvel thou art! We know not which most to wonder at, the faithfulness of God or the unbelief of his people. He keeps his promise a thousand times, and yet the next trial makes us doubt him. He never faileth; he is never a dry well; he is never as a setting sun, a passing meteor, or a melting vapour; and yet we are as continually vexed with anxieties, molested with suspicions, and disturbed with fears, as if our God were the mirage of the desert.

– C. H. Spurgeon, Morning and Evening: Daily Readings, (London: Passmore & Alabaster, 1896).