5. A man convinced against his will is still of the same opinion.
May I suggest instead:
He that complies against his will
Is of his own opinion still.
Samuel Butler (1612-1680)
Hudibras. Part iii. Canto iii. Line 547. http://www.bartleby.com/100/168.69.html
a) Scans better.
b) Rhymes better.
c) Has priority.
d) Makes sense -- "Convince" means to persuade or
satisfy by argument or evidence, which means he
doesn't still have a different opinion. But he
could comply without being convinced.
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Other contributions:
*) 300,000 km per second --
It's not just a good idea, it's the law.
*) It's bad luck to prove things that aren't true.
*) To first order, almost everything is linear.
*) Almost everything is horizontal at the top.
*) No matter what you're doing, you can always do it wrong.
*) Throw physic to the dogs: I'll none of it.
Macbeth. Act V, scene 3.
*) His progress is proportional to the square root of time.
(i.e. it's completely random)