The human race is challenged more than ever before to demonstrate our mastery, not over nature but of ourselves.

There is something infinitely healing in the repeated refrains of nature.

It is not half so important to know as to feel.

Have we fallen into a mesmerized state that makes us accept as inevitable that which is inferior or detrimental, as though having lost the will or the vision to demand that which is good?

Those who dwell, as scientists or laymen, among the beauties and mysteries of the earth, are never alone or weary of life.

Darling -- I suppose the world would consider us absolutely crazy, but it is wonderful to feel that way, isn't it? Sort of a perpetual springtime in our hearts.

There is one quality that characterizes all of us who deal with the sciences of the earth and its life - we are never bored.