Many a truth is the result of an error.
Happy slaves are the bitterest enemies of freedom.
When curiosity turns to serious matters, it's called research.
You can sink so fast that you think you are flying.
It's bad enough when married people bore one another, but it's much worse when only one of them bores the other.
The poor man wishes to conceal his poverty, and the rich man his wealth: the former fears lest he be despised, the latter lest he be plundered.