To go out of your mind once a day is tremendously important, because by going out of your mind you come to your senses. And if you stay in your mind all of the time, you are over rational, in other words you are like a very rigid bridge which because it has no give; no craziness in it, is going to be blown down by the first hurricane.
Conformity may give you a quiet life; it may even bring you to a University Chair. But all change in history, all advance, comes from the nonconformists. If there had been no trouble-makers, no Dissenters, we should still be living in caves.
"Painters and poets," you say, "have always had an equal license in bold invention." We know; we claim the liberty for ourselves and in turn we give it to others.
The feeling for what ought and ought not to be grows and dies like a tree, and no fertilizer of any kind will do much good. What the individual can do is give a fine example, and have the courage to firmly uphold ethical convictions in a society of cynics. I have for a long time tried to conduct myself this way, with varying success.