For this cause many are weak and sickly among you, and many sleep.
Weak and sickly. The "weak" х astheneis (G772)] have naturally no strength; the "sickly" х arroostoi (G732)] have lost their strength by disease.
Sleep - in death: not a violent death; but the result of sickness, the Lord's chastening for the individual's salvation, the mind being brought to a right state on the sick-bed (1 Corinthians 11:32).