"A system is said to be coherent if every fact in the system is related every other fact in the system by relations that are not merely conjunctive. A deductive system affords a good example of a coherent system."

“There are many ways of being wrong, but only one way of being right.”

“We must face the unfortunate fact that we are moved to the acceptance of beliefs by factors that are wholly irrelevant to their truth.”

“I am convinced of the urgent need for democratic people to think clearly without the distortions due to unconscious bias and unrecognised ignorance. Our failures in thinking in part due to our faults which we could to some extent overcome were we to see clearly how these faults arise.”

“A mind in blinkers is a mind that is unfree.”

“...we easily fall into the habit of accepting compressed statements which save us from the trouble of thinking. Thus arises what I shall call ‘Potted Thinking’.”

“...potted thinking is easily accepted, is concentrated in form, and has lost the vitamins essential to mental nourishment.”