Ask counsel of him who rules himself well.
A good memory, which nature has endowed us with, causes things long past to seem present.
I shall do down in history as the man who opened a door!
Every part is disposed to unite with the whole, that it may thereby escape from its own incompleteness.
Therefore, O students, study mathematics and do not build without foundations.
Anyone who conducts an argument by appealing to authority is not using his intelligence; he is just using his memory.