Knowledge is happiness, because to have knowledge — broad, deep knowledge — is to know true ends from false, and lofty things from low. To know the thoughts and deeds that have marked man’s progress is to feel the great heart-throbs of humanity through the centuries; and if one does not feel in these pulsations a heavenward striving, one must indeed be deaf to the harmonies of life.

Helen Keller (1880–1968) American author and lecturer

The Story of My Life, pt. 1, ch. 20 (1903)