Sin is to a nature what blindness is to an eye. The blindness of an evil or defect which is a witness to the fact that the eye was created to see the light and, hence, the very lack of sight is the proof that the eye was meant... to be the one particularly capable of seeing the light. Were it not for this capacity, there would be no reason to think of blindness as a misforture.
Saint AugustineWatch, O Lord, with those who wake, or watch or weep tonight, and give your angels charge over those who sleep. Tend your sick ones, O Lord Jesus Christ; rest your weary ones; bless your dying ones; soothe your suffering ones; pity your afflicted ones; shield your joyous ones; and all for your love's sake. Amen.
Saint Augustine