A generation which ignores history has no past and no future.
Robert Heinlein (1907 - 1988), The Notebooks of Lazurus Long

History does not record anywhere at any time a religion that has any rational basis. Religion is a crutch for people not strong enough to stand up to the unknown without help. But, like dandruff, most people do have a religion and spend time and money on it and seem to derive considerable pleasure from fiddling with it.
Robert Heinlein (1907 - 1988), Time Enough for Love (1972)

Stupidity cannot be cured with money, or through education, or by legislation. Stupidity is not a sin, the victim can't help being stupid. But stupidity is the only universal capital crime: the sentence is death, there is no appeal, and execution is carried out automatically and without pity.
Robert A. Heinlein, Time Enough For Love

Theology is never any help; it is searching in a dark cellar at midnight for a black cat that isn't there. Theologians can persuade themselves of anything.
Robert A. Heinlein