Arguments are extremely vulgar, for everyone in good society holds exactly the same opinion.

A good decision is based on knowledge and not on numbers.

Bad times have a scientific value. These are occasions a good learner would not miss.

If to do were as easy as to know what were good to do, chapels had been churches, and poor men's cottage princes' palaces.

The only thing to do with good advice is to pass it on. It is never of any use to oneself.