Few men make themselves masters of the things they write or speak.

Wit and wisdom are born with a man.

Take a straw and throw it up into the air - you may see by that which way the wind is.

No man is the wiser for his learning.

If one is master of one thing and understands one thing well, one has at the same time, insight into and understanding of many things.

Let us tenderly and kindly cherish therefore, the means of knowledge. Let us dare to read, think, speak, and write.

The best way to become acquainted with a subject is to write a book about it.