Men are joined by conviction, sundered by opinion.

Judge a man's character by what he finds ridiculous.

The desire to explain what is simple by what is complex, what is easy by what is difficult, is a calamity.

Only he who finds empiricism irksome is driven to method.

What people call the spirit of the times is mostly their own spirit in which the times mirror themselves.

Is it life, I ask, is it even prudence, To bore thyself and bore the students?

One glance, one word from you gives more pleasure than all the wisdom of this world.