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

A superstition is a premature explanation that overstays its time.

We despair of changing the habits of men, still we would alter institutions, the habits of millions of men.

Boundaries which mark off one field of science from another are purely artificial, are set up only for temporary convenience. Let chemists and physicists dig deep enough, and they reach common ground.

They will listen with both ears to what is said by the men just a step or two ahead of them, who stand nearest to them, and within arm's reach. A guide ceases to be of any use when he strides so far ahead as to be hidden by the curvature of the earth.

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

Error held as truth has much the effect of truth. In politics and religion this fact upsets many confident predictions.