[MA-30]
BAD HABITS IN REASONING
The usual false conclusions of mankind are these: a thing exists, therefore it has a right to exist. Here there is inference from the ability to live to its suitability; from its suitability to its rightfulness. Then: an opinion brings happiness; therefore it is the true opinion. Its effect is good; therefore it is itself good and true. To the effect is here assigned the predicate beneficent, good, in the sense of the useful, and the cause is then furnished with the same predicate good, but here in the sense of the logically valid. The inversion of the sentences would read thus: an affair cannot be carried through, or maintained, therefore it is wrong; an opinion causes pain or excites, therefore it is false. The free spirit who learns only too often the faultiness of this mode of reasoning, and has to suffer from its consequences, frequently gives way to the temptation to draw the very opposite conclusions, which, in general, are naturally just as false: an affair cannot be carried through, therefore it is good; an opinion is distressing and disturbing, therefore it is true.