Life is made up, not of great sacrifices or duties, but of little things, in which smiles and kindness, and small obligations given habitually, are what preserve the heart and secure comfort.

Language is not only the vehicle of thought, it is a great and efficient instrument in thinking.

I have learned more from my mistakes than from my successes.

The art galleries of Paris contain the finest collection of frames I ever saw.

The most important of my discoveries have been suggested to me by my failures.

In the present state of our knowledge, it would be useless to attempt to speculate on the remote cause of the electrical energy... its relation to chemical affinity is, however, sufficiently evident. May it not be identical with it, and an essential property of matter?

When two elements combine and form more than one compound, the masses of one element that react with a fixed mass of the other are in the ratio of small whole numbers.