It's hard work!

Most people think only once in their lives, usually when they are at college. After that their minds are made up, and their decisions, utterances are endless repetitions of views that have in the meantime become obsolete, outworn, unsound. This applies to politics, scholarship, the arts as well as to social service. Views,’ just as leaves, are bound to wither, because the world is in flux. But so many of us would rather be faithful to outworn views than to undergo the strain of reexamination and revision. Indeed, intellectual senility sets in long before physical infirmity. A human being must be valued by how many times he was able to see the world from a new perspective.—Abraham Joshua Heschel in Moral Grandeur and Spiritual Audacity: Essays, 20