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.
Susan StebbingThe opposite of thinking clearly is being muddled. To be conscious of being muddled is a horrible experience. To avoid it we may even be tempted to shut our minds and swallow a belief, ready-made, from some expert authority.
Susan Stebbing