Doubt is the beginning, not the end, of wisdom.

Evolution pays and that is why there is evolution

Form may be of more account than substance. A lens of ice will focus a solar beam to a blaze.

Dumbness and silence are two different things.

A calculating engine is one of the most intricate forms of mechanism, a telegraph key one of the simplest. But compare their value.

Nature is full of by-ends. A moth feeds on a petal, in a moment the pollen caught on its breast will be wedding this blossom to another in the next county.

Educated folk keep to one another's company too much, leaving other people much like milk skimmed of its cream.