Some men are like nails, very easily drawn; others however are more like rivets never drawn at all.
Nature teaches more than she preaches. There are no sermons in stones. It is easier to get a spark out of a stone than a moral.
Life is a struggle, but not a warfare.
Leap, and the net will appear.
It is always easier to believe than to deny. Our minds are naturally affirmative.
If you think you can do it, you can.
If we take science as our sole guide, if we accept and hold fast that alone which is verifiable, the old theology must go.
I seldom go into a natural history museum without feeling as if I were attending a funeral.
I go to nature to be soothed and healed, and to have my senses put in order.
How beautiful the leaves grow old. How full of light and color are their last days.