When a book and a head collide and a hollow sound is heard, must it always have come from the book?

Erudition can produce foliage without bearing fruit.

Most men of education are more superstitious than they admit - nay, than they think.

To err is human also in so far as animals seldom or never err, or at least only the cleverest of them do so.

There is no greater impediment to progress in the sciences than the desire to see it take place too quickly.

I made the journey to knowledge like dogs who go for walks with their masters, a hundred times forward and backward over the same territory; and when I arrived I was tired.

You can make a good living from soothsaying but not from truthsaying.