The rejection of contradiction is a fundamental feature of Western logic. According to the non contradiction principle, it is not possible to support something and its opposite, A and not A: the elementary logical world is made up of stable elements that have stable relationships with each other.

The principle of non-contradiction is the basis of ordinary reasoning, as well as logical and scientific reasoning. In ordinary exchanges we tend to talk about coherence. If the same person has just argued this and now, three minutes later, argues that, and if this and that are contradictory, he owes his interlocutors at least an explanation; if he makes incoherent statements in the same discussion, he destroys the discussion.

Mental confusion characterises the state of contradiction

The requirement of coherence does not only apply to statements. The following case appeals to the coherence of feelings (Leslie 1964, [1]); lack of coherence leads to (mental) confusion

Confucius, Analects_Eno
12.10 Zizhang asked about […] discerning confusion. The Master said […] When one cherishes a person, one wishes him to live; when one hates a person, one wishes him to die – on the one hand cherishing and wishing him life, while, on the other, hating and wishing him death that is confusion.
Truly, it is not a matter of riches, Indeed, it is simply about discernment.