I no longer believed in the known God of the Bible, but rather in the mysterious God expressed in nature.

God has given me a mule-like stubbornness to stick with a difficult problem and the intuitive powers to conceptualize complex hypothetical situations in my mind.

Our death is not an end if we can live on in our children and the younger generation. For they are us; our bodies are only wilted leaves on the tree of life.

I am truly a "lone traveler" and have never belonged to my country, my home, my friends, or even my immediate family, with my whole heart.

I was originally supposed to become an engineer but the thought of having to expend my creative energy on things that make practical everyday life even more refined, with a loathsome capital gain as the goal, was unbearable to me.

In the teaching of geography and history a sympathetic understanding (should) be fostered for the characteristics of the different peoples of the world, especially for those who we are in the habit of describing as "primitive.

Don't wait for miracles, your whole life is a miracle.