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 AugustineTrue happiness is to rejoice in the truth, for to rejoice in the truth is to rejoice in You, O God, who are the truth... Those who think that there is another kind of happiness look for joy elsewhere, but theirs is not true joy.
Saint Augustine