Consistency in opinion is the slow poison of intellectual life, the destroyer of its vividness and energy.

What is politeness in the home but the outcome of affection and self-respect, and the suppression of all those natural instincts of self-seeking that, allowed their way, produce the worst manners in the world?

Every discovery opens a new field for investigation of facts, shows us the imperfection of our theories. It has justly been said, that the greater the circle of light, the greater the boundary of darkness by which it is surrounded.

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

The well-mannered man never puts out his hand in greeting until a lady extends hers. This is a test of good breeding that is constantly applied. ... The first move in the direction of cordiality must come from the lady, the whole code of behaviour being based on the assumption that she is the social superior.

There may be beings, thinking beings, near or surrounding us, which we do not perceive, which we cannot imagine. We know very little; but, in my opinion, we know enough to hope for the immortality, the individual immortality, of the better part of man.

Nothing tends so much to the advancement of knowledge as the application of a new instrument. The native intellectual powers of men in different times are not so much the causes of the different success of their labours, as the peculiar nature of the means and artificial resources in their possession.