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For example, 'upward' cannot exist unless there is a 'downward', they are opposites but they co-substantiate one another, their unity is that either one exists because the opposite is necessary for the existence of the other, one manifests immediately with the other.
The concept of "necessary evil" is an idea that must be thoroughly rejected. Evil is not necessary, and to accept it as such is to perpetuate it. Evil must be opposed, rejected, and avoided at all costs. It should never be viewed as something that we must unavoidably and inevitably participate in. We trivialize evil when we refer to it as ...
Verbosity, or verboseness, is speech or writing that uses more words than necessary. [1] The opposite of verbosity is succinctness. [dubious – discuss] Some teachers, including the author of The Elements of Style, warn against verbosity. Similarly Mark Twain and Ernest Hemingway, among others, famously avoided it.
In logic, contingency is the feature of a statement making it neither necessary nor impossible. [1] [2] Contingency is a fundamental concept of modal logic.Modal logic concerns the manner, or mode, in which statements are true.
A number's being divisible by 4 is sufficient (but not necessary) for it to be even, but being divisible by 2 is both sufficient and necessary for it to be even. Example 3 An occurrence of thunder is a sufficient condition for the occurrence of lightning in the sense that hearing thunder, and unambiguously recognizing it as such, justifies ...
The opposite principle "everything which is not allowed is forbidden" states that an action can only be taken if it is specifically allowed. A senior English judge, Sir John Laws , stated the principles as: "For the individual citizen, everything which is not forbidden is allowed; but for public bodies, and notably government, everything which ...
Reverse psychology is a technique involving the assertion of a belief or behavior that is opposite to the one desired, with the expectation that this approach will encourage the subject of the persuasion to do what is actually desired.
More broadly, proof by contradiction is any form of argument that establishes a statement by arriving at a contradiction, even when the initial assumption is not the negation of the statement to be proved. In this general sense, proof by contradiction is also known as indirect proof, proof by assuming the opposite, [2] and reductio ad ...