One is tempted to say that the most human plants, after all, are the weeds.

That which distinguishes this day from all others is that then both orators and artillerymen shoot blank cartridges.

Natural history is a matter of observation; it is a harvest which you gather when and where you find it growing. Birds and squirrels and flowers are not always in season, but philosophy we have always with us. It is a crop which we can grow and reap at all times and in all places and it has its own value and brings its own satisfaction.

If I were to name the three most precious resources of life, I should say books, friends, and nature.

He who marvels at the beauty of the world in summer will find equal cause for wonder and admiration in winter.

I still find each day too short.

One may return to the place of his birth, He cannot go back to his youth.