Men love to wonder and that is the seed of science.
All mankind love a lover.
People disparage knowing and the intellectual life and urge doing. I am content with knowing if only I could know.
As soon as there is life there is danger.
Don't be too timid and squeamish about your actions. All life is an experiment.
It is one of the beautiful compensations in this life that no one can sincerely try to help another without helping himself.
A chief event of life is the day in which we have encountered a mind that startled us.
To know even one life has breathed easier because you have lived. This is to have succeeded.
Life consists in what a man is thinking of all day.
It is not length of life but depth of life.
All life is an experiment. The more experiments you make the better.
No man ever prayed heartily without learning something.
Knowledge is knowing that we cannot know.
Genius always finds itself a century too early.
Common sense is genius dressed in its working clothes.
Science does not know its debt to imagination.
The health of the eye seems to demand a horizon. We are never tired so long as we can see far enough.
Great men or men of great gifts you shall easily find but symmetrical men never.
The search after the great men is the dream of youth and the most serious occupation of manhood.
Great geniuses have the shortest biographies.
No great man ever complains of want of opportunity.
Great hearts steadily send forth the secret forces that incessantly draw great events.
People with great gifts are easy to find but symmetrical and balanced ones never.
Before we acquire great power we must acquire wisdom to use it well.
Nothing great was ever achieved without enthusiasm.