The weakness of sorrow never appears in any respect agreeable, except when it arises from what we feel for others more than from what we feel for ourselves.
 Adam Smith, The Theory of Moral Sentiments (1759). copy citation

Context

“We cannot bring ourselves to feel for him what he feels for himself, and what, perhaps, we should feel for ourselves if in his situation: we, therefore, despise him; unjustly, perhaps, if any sentiment could be regarded as unjust, to which we are by nature irresistibly determined. The weakness of sorrow never appears in any respect agreeable, except when it arises from what we feel for others more than from what we feel for ourselves. A son, upon the death of an indulgent and respectable father, may give way to it without much blame. His sorrow is chiefly founded upon a sort of sympathy with his departed parent; and we readily enter into this humane emotion.” source