David needed relief. He spoke as though he felt God was chewing up his life as a moth eats a garment. The long duration of his affliction made him sense the brevity of life. God was disciplining him (cf. Hebrews 12:5-11). [source][source][source]
"God whispers to us in our pleasures, speaks in our conscience, but shouts in our pains: it is His megaphone to arouse a deaf world." [1][source]