The true scholar grudges every opportunity of action passed, by, as a loss of power.

A skilful man reads his dreams for his selfknowledge; yet not the details, but the quality.

Of all tools, an observatory is the most sublime. . . . What is so good in a college as an observatory? The sublime attaches to the door and to the first stair you ascent, that this is the road to the stars.

The measure of a master is his success in bringing all men around to his opinion twenty years later.

Human beings cannot endure the geological chaos they encounter under the soil of their own gardens.

I am sure of this, that by going much alone a man will get more of a noble courage in thought and word than from all the wisdom that is in books.

We are ashamed of our thoughts and often see them brought forth by others.