We may sit in our library and yet be in all quarters of the earth.

Great battles are really won before they are actually fought. To control our passions we must govern our habits, and keep watch over ourselves in the small details of everyday life.

There can be no merit in believing something which you can neither explain nor understand.

Fresh air is as good for the mind as for the body. Nature always seems trying to talk to us as if she had some great secret to tell. And so she has.

Happy indeed is the naturalist: to him the seasons come round like old friends; to him the birds sing: as he walks along, the flowers stretch out from the hedges, or look up from the ground, and as each year fades away, he looks back on a fresh store of happy memories.

When important decisions have to be taken, the natural anxiety to come to a right decision will often keep you awake. Nothing, however, is more conducive to healthful sleep than plenty of open air.

A crowd is not necessarily company, but neither need it necessarily prevent thought or disturb peace of mind.