Civilizations die from philosophical calm, irony, and a sense of fair play quite as surely as they die of debauchery.

Not to have known - as most men have not - either the mountain or the desert is not to have known one's self. Not to have known one's self is to have known no one.

Only those within whose own consciousness the sun rise and set, the leaves burgeon and wither, can be said to be aware of what living is.

There is no such thing as a dangerous woman; there are only susceptible men.

If we do not permit the earth to produce beauty and joy, it will in the end not produce food, either.

Science has always promised two things not necessarily related; an increase first in our powers, second in our happiness or wisdom, and we have come to realize that it is the first and less important of the two promises which it has kept most abundantly.

Happiness is a kind of gratitude and vice versa.