Keep not standing fixed and rooted. Briskly venture, briskly roam.

With the growth of knowledge our ideas must from time to time be organized afresh. The change takes place usually in accordance with new maxims as they arise, but it always remains provisional.

There is nothing more frightful than for a teacher to know only what his scholars are intended to know.

God made man simple, but how he changed and got complicated is hard to say.

Daily life is more instructive than the most effective book.

To like things like, whatever one may ail; There is certain help.

At all times it has not been the age, but individuals alone, who have worked for knowledge. It was the age which put Socrates to death by poison, the age which burnt Huss. The ages have always remained alike.