We especially need imagination in science.

We have a hunger of the mind which asks for knowledge of all around us, and the more we gain, the more is our desire the more we see, the more we are capable of seeing.

That knowledge which is popular is not scientific.

I am just learning to notice the different colors of the stars, and already begin to have a new enjoyment.

The world of learning is so broad, and the human soul is so limited in power!