The luster of diamonds is invigorated by the interposition of darker bodies; the lights of a picture are created by the shades; the highest pleasure which nature has indulged to sensitive perception is that of rest after fatigue. – Samuel Johnson
The mind is seldom quickened to very vigorous operations but by pain, or the dread of pain. We do not disturb ourselves with the detection of fallacies which do us no harm. – Samuel Johnson