May God defend me from my friends: I can defend myself from my enemies.
We look to Scotland for all our ideas of civilisation.
One of the chief misfortunes of honest people is that they are cowardly.
When he who hears does not know what he who speaks means, and when he who speaks does not know what he himself means, that is philosophy.
He who thinks himself wise, O heavens! is a great fool.
When we cannot use the compass of mathematics or the torch of experience...it is certain we cannot take a single step forward.