The Theory of Moral Sentiments (First Edition) - Adam Smith

"How selfish soever man may be supposed, there are evidently some principles in his nature, which interest him in the fortunes of others, and render their happiness necessary to him, though he derives nothing from it, except the pleasure of seeing it." (from The Theory of Moral Sentiments)
note: This is the First edition, the 6th edition was revised and extra material added.