On two subjects the ...

On two subjects the overwhelming majority of people regarded their own opinions as Absolute Truth, and sincerely believed that anyone who disagreed with them was immoral, outrageous, sinful, sacrilegious, offensive, intolerable, stupid, illogical, treasonable, actionable, against the public interest, ridiculous, and obscene. The two subjects were (of course) sex and religion.
On two subjects the overwhelming majority of people regarded their own opinions as Absolute Truth, and sincerely believed that anyone who disagreed with them was immoral, outrageous, sinful, sacrilegious, offensive, intolerable, stupid, illogical, treasonable, actionable, against the public interest, ridiculous, and obscene. The two subjects were (of course) sex and religion.
 Robert A. Heinlein

Quotes from the same author

We learned not to waste ammo even on warriors except in self-protection
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 Robert A. Heinlein
A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear arms, shall not be infringed. - Second Amendment to the Constitution An armed society is a polite society.
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 Robert A. Heinlein
An armed society is a polite society. Manners are good when one may have to back up his acts with his life.
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 Robert A. Heinlein
Love is that condition in which the happiness of another person is essential to your own.
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 Robert A. Heinlein
Delusions are often functional. A mother's opinions about her children's beauty, intelligence, goodness, et cetera ad nauseam, keep her from drowning them at birth.
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 Robert A. Heinlein