"A man's interest in the world is only the overflow from his interest in himself. When you are a child your vessel is not yet full;so you care for nothing but your own affairs. When you grow up, your vessel overflows; and you are a politician, a philosopher, or an explorer and adventurer. In old age the vessel dries up: there is no overflow: you are a child again."

Source: George Bernard Shaw (2015). “The Collected Plays of George Bernard Shaw (Illustrated): Including Renowned Titles like Pygmalion, Mrs. Warren’s Profession, Candida, Arms and The Man, Man and Superman, The Inca Of Perusalem, Macbeth Skit, Caesar and Cleopatra, Androcles And The Lion”, p.2934, e-artnow