Destroying species is like tearing pages out of an unread book, written in a language humans hardly know how to read, about the place where they live.
Age is no guarantee of maturity.
The greatest compliment that was ever paid to me was when one asked me what I thought and attended to my answer.
It is as easy to dream a book as it is hard to write one.
What you do speaks so loud that I cannot hear what you say.
A thinker sees his own actions as experiments and questions—as attempts to find out something. Success and failure are for him answers above all.
There is a road from the eye to the heart that does not go through the intellect.
The palest ink is better than the best memory.
Don’t limit a child to your own learning, for he was born in another time.
There is a loftier ambition than merely to stand high in the world. It is to stoop down and lift mankind a little higher.