Seems to be a deep instinct in human beings for making everything compulsory that isn't forbidden.
Robert A. HeinleinThat old saw about the early bird just proves that the worm should have stayed in bed.
Robert A. HeinleinAround the time of the Terran Caesar Augustus, a Martian artist had been composing a work of art. It could have been called a poem, a musical opus, or a philosophical treatise; it was a series of emotions arranged in tragic, logical necessity. Since it could be experienced by a human only in the sense in which a man blind from birth might have a sunset explained to him, it does not matter which category it be assigned.
Robert A. Heinlein