Mankind suffers from two excesses: to exclude reason, and to live by nothing but reason.
The principles of pleasure are not firm and stable. They are different in all mankind, and variable in every particular with such a diversity that there is no man more different from another than from himself at different times.
By a peculiar prerogative, not only each individual is making daily advances in the sciences, and may make advances in morality (which is the science, by way of eminence, of living well and being happy), but all mankind together is making a continual progress in proportion as the universe grows older. So that the whole human race, during the course of so many ages, may be considered as one man who never ceases to live and learn.
All mankind's troubles are caused by one single thing, which is their inability to sit quietly.
The more I see of Mankind, the more I prefer my dog.
All the miseries of mankind come from one thing, not knowing how to remain alone.
Those whom we call ancient were really new in all things, and properly constituted the infancy of mankind.
All mankind's unhappiness derives from one thing: his inability to know how to remain in repose in one room.
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