It is the Lord ... - Compare the devout submission of Aaron Leviticus 10:3, and of Hezekiah 2 Kings 20:19. And, for the highest conceivable submission to the will of God, compare Luke 22:42.
Related Commentaries of 1 Samuel 3:18
1 Samuel 3:18
18 And Samuel told him every whit, and hid nothing from him. And he said, It is the LORD: let him do what seemeth him good.