Psychological Types, Chapter 10, page 435:
In accordance with his definition, we must picture a, man whose constant aim -- in so far, of course, as he is a pure type -- is to bring his total life-activities into relation with intellectual conclusions, which in the last resort are always orientated by objective data, whether objective facts or generally valid ideas. This type of man gives the deciding voice-not merely for himself alone but also on behalf of his entourage-either to the actual objective reality or to its objectively orientated, intellectual formula. By this formula are good and evil measured, and beauty and ugliness determined. All is right that corresponds with this formula; all is wrong that contradicts it; and everything that is neutral to it is purely accidental. Because this formula seems to correspond with the meaning of the world, it also becomes a world-law whose realization must be achieved at all times and seasons, both individually and collectively. Just as the extraverted thinking type subordinates himself to his formula, so, for its own good, must his entourage also obey it, since the man who refuses to obey is wrong -- he is resisting the world-law, and is, therefore, unreasonable, immoral, and without a conscience. His moral code forbids him to tolerate exceptions; his ideal must, under all circumstances, be realized; for in his eyes it is the purest conceivable formulation of objective reality, and, therefore, must also be generally valid truth, quite indispensable for the salvation of man. This is not from any great love for his neighbour, but from a higher standpoint of justice and truth. Everything in his own nature that appears to invalidate this formula is mere imperfection, an accidental miss-fire, something to be eliminated on the next occasion, or, in the event of further failure, then clearly a sickness.