There is no excellence without labor. One cannot dream oneself into either usefulness or happiness.

I do not yet know why plants come out of the land or float in streams, or creep on rocks or roll from the sea. I am entranced by the mystery of them and absorbed by their variety and kinds. Everywhere, they are visible yet everywhere occult.

My life has been a continuous fulfillment of dreams. It appears that everything I saw and did has a new, and perhaps, more significant meaning, every time I see it. The earth is good. It is a privilege to live thereon.

A person cannot love a plant after he has pruned it, then he has either done a poor job or is devoid of emotion.

Science may eventually explain the world of How. The ultimate world of Why may remain for contemplation, philosophy, religion.

The true purpose of education is to teach a man to carry himself triumphant to the sunset.

When the traveler goes alone he gets acquainted with himself.