Peirce, Charles Sanders

"The growth of the mind consists in its ability to acquire new thoughts."

"All reasoning is analogical."

"The mind thinks in signs, and signs are triadic in nature."

"Man is not whole without continual intercourse with nature."

"The true is only the expedient in the way of our thinking."

"Ignorance is the womb of monsters."

"A person is but a particular kind of thing, a system of habits."

"The secret to discovery is not in seeking new lands but new eyes."

"Logic is the study of the essential conditions to which any knowledge must conform."

"Man's circle of knowledge has a certain umbra of ignorance about it."

"Meditation upon symbols is the business of a genuine thinker."

"The essence of belief is the establishment of a habit."

"All things are continuous, the universe is not made of discrete atoms."

"Do not block the way of inquiry."

"Symbols grow; they come into being by development out of other signs."

"The real is that which insists upon forcing its way to recognition."

"Beauty is the promise of function."

"We cannot think at all without signs and symbols."

"The agapistic principle embraces evolutionary love as the fundamental reality."

"A sign is something which stands to somebody for something in some respect or capacity."

"The ultimate good lies in the evolutionary process itself."

"Men are not lumbering machines, machines are lumbering men."

"The genealogy of our ideas is often more important than their immediate significance."

"To say that human thought is symbolic is to say that it is social."

"The very idea that the genuine mode of life for man is to acquire, to own, to make money."

"Ignorance of the law is no excuse, for a law of nature cannot be unknown."

"All reasoning is of the nature of explaining one fact by another."

"The motion of the heavens, the growth of plants, all that we perceive reveals design."

"A writer should have a spirit of sincere devotion to truth."

"The greatest instrument of research is the human mind."