ユングが書いたTi(内向論理)

Introverted thinking is primarily orientated by the subjective factor.〔中略〕Hence, it does not lead from concrete experience back again into objective things, but always to the subjective content. External facts are not the aim and origin of this thinking, although the introvert would often like to make it so appear. It begins in the subject, and returns to the subject, although it may undertake the widest flights into the territory of the real and the actual.

formulates questions and creates theories; it opens up prospects and yields insight, but in the presence of facts it exhibits a reserved demeanour. As illustrative examples they have their value, but they must not prevail. Facts are collected as evidence or examples for a theory, but never for their own sake.〔中略〕Its desire is to reach reality ; its goal is to see how external facts fit into, and fulfil, the framework of the idea

as Darwin might possibly represent the normal extraverted thinking type, so we might point to Kant as a counter-example of the normal introverted thinking type. The former speaks with facts; the latter appeals to the subjective factor.〔中略〕decisively influenced by ideas ; these, however, have their origin, not in the objective data but in the subjective foundation. Like the extravert, he too will follow his ideas, but in the reverse direction : inwardly not outwardly. Intensity is his aim, not extensity.

Thus, the introverted rational types unquestionably have a reasoning judgment, only it is a judgment whose leading note is subjective. The laws of logic are not necessarily deflected, since its onesidedness lies in the premise.〔中略〕Thus, to the introvert, to mention the most general instance, that chain of reasoning which leads to the subjective factor appears rather more reasonable than that which leads to the object.

In thinking out his problems to the utmost of his ability, he also complicates them, and constantly becomes entangled in every possible scruple. However clear to himself the inner structure of his thoughts may be, he is not in the least clear where and how they link up with the world of reality. Only with difficulty can he persuade himself to admit that what is clear to him may not be equally clear to everyone.