Christina Rossetti - Good Friday lyrics

Am I a stone and not a sheep That I can stand, O Christ, beneath Thy Cross, To number drop by drop Thy Blood's slow loss, And yet not weep? Not so those women loved Who with exceeding grief lamented Thee; Not so fallen Peter weeping bitterly; Not so the thief was moved; Not so the Sun and Moon Which hid their faces in a starless sky, A horror of great darkness at broad noon,-- I, only I. Yet give not o'er, But seek Thy sheep, true Shepherd of the flock; Greater than Moses, turn and look once more And smite a rock.