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Plan/Wittgenstein: Thinking means to operate with plans - the thought needs no interpretation - the plan needs an interpretation - the rules of interpretation of a plan do not belong to the plan itself - science: like building a house - philosophy: like tidying.
Thinking/Wittgenstein: is a symbolic operation - analog: E.g. digestion: a) characteristic of a human being - b) chemical process - Definition thinking: interpretation of a plan - Telepathy: could only be interpretation of symbols - at the same level as language.
Thinking/Language/Wittgenstein: we think with the help of the sign. To think of a thing means to think of a sentence in which it occurs - the occasion does not belong to thinking - but the words do - one sentence is a mechanism - not a bunch of individual parts.
Thinking/Wittgenstein: no "representative in the mind" - the thought is autonomous - it does not point beyond itself - we only believe that because of the way we use symbols - there is no mental process that cannot be symbolized - we are only interested in what can be symbolized.
Thinking/Language/Wittgenstein: Thinking not possible without language.
Thinking/Tractatus: 6.361 in the way of expression by Hertz one could say: only legitimate connections are conceivable.
Thinking/expression/limit/Tractatus/Foreword/Wittgenstein: not the thinking, but the expression is a drawn limit.
Kant/Tetens: knowledge: the frontier of knowledge can be crossed in both directions - sense/nonsense/Wittgenstein/Tetens: this limit cannot be exceeded.
Language/thinking/Tractatus/Tetens: what we think must be logically possible. (See FIG. 4,031)
Vorlesungen 1930-35 Frankfurt 1989
Das Blaue Buch - Eine Philosophische Betrachtung Frankfurt 1984
Tractatus Logico Philosophicus Frankfurt/M 1960