A great teacher makes hard things easy.

All writing comes by the grace of God.

Each particle is a microcosm, and faithfully renders the likeness of the world.

He is a dull observer whose experience has not taught him the reality and force of magic, as well as of chemistry.

The arts and inventions of each period are only its costume, and do not invigorate men.

When I bought my farm, I did not know what a bargain I had in the bluebirds, daffodils and thrushes; as little did I know what sublime mornings and sunsets I was buying.

It seems to be a rule of wisdom never to rely on memory alone.