Curiosity is as much the parent of attention, as attention is of memory.

The word of knowledge, strictly employed, implies three things: truth, proof, and conviction.

Of metaphors, those generally conduce most to energy or vivacity of style which illustrate an intellectual by a sensible object.

As a science, logic institutes an analysis of the process of the mind in reasoning, and investigating the principles on which argumentation is conducted; as an art, it furnishes such rules as may be derived from those principles, for guarding against erroneous deductions.

Though not always called upon to condemn ourselves, it is always safe to suspect ourselves.

Women never reason, or, if they do, they either draw correct inferences from wrong premises, or wrong inferences from correct premises; and they always poke the fire from the top.

A man is called selfish not for pursuing his own good, but for neglecting his neighbor's.