@ACB,
ACB;129185 wrote:OK, I have.
Look up "think" and "thank" in the Online Etymology Dictionary. You may find the results interesting. :detective:
thank (v.) 
O.E. ?ancian "to give thanks," from P.Gmc. *thankojan (cf. O.S. thancon, O.N. ?akka, Dan. takke, O.Fris. thankia, M.Du., Ger. danken "to thank"), from *thankoz "thought, gratitude," from PIE base *tong- "to think, feel." For sense evolution, cf. related O.E. noun ?anc, ?onc, originally "thought," but by c.1000 "good thoughts, gratitude." The whole group is from the same root as
think (q.v.). In ironical use, "to blame," from 1550s. Thank you is attested from c.1400, short for I thank you. To thank (someone) for nothing is recorded from 1703.
think 
O.E. ?encan "conceive in the mind, think, consider, intend" (past tense ?ohte, p.p. ge?oht), probably originally "cause to appear to oneself," from P.Gmc. *thankjan (cf. O.Fris. thinka, O.S. thenkian, O.H.G. denchen, Ger. denken, O.N. ?ekkja, Goth. ?agkjan); O.E. ?encan is the causative form of the distinct O.E. verb ?yncan "to seem or appear" (past tense ?uhte, pp. ge?uht), from P.Gmc. *thunkjan (cf. Ger. d?nken, d?uchte). Both are from PIE *tong- "to think, feel" which also is the root of
thought and
thank. The two meanings converged in M.E. and ?yncan "to seem" was absorbed, except for archaic
methinks "it seems to me." Jocular pp. thunk (not historical, but by analogy of
drink,
sink, etc.) is recorded from 1876. Think-tank is 1959 as "research institute" (first ref. is to Center for Behavioral Sciences, Palo Alto, Calif.); it had been colloquial for "the brain" since 1905.
---------- Post added 02-17-2010 at 12:11 AM ----------
kennethamy;129187 wrote:There is some distant root connection between "think" and "thank". But not, of course, the kind of semantic connection Heidegger claims (invents) there is. Or any semantic connection, for that matter. So, what is supposed to be interesting about it?
The Online Etymological dictionary is not the last word, but it strengthens H's case. As far as the German goes, I'm no expert.
But besides the actual derivation, it's just as important to understand WHY Heidegger is associating thought and gratitude. Let's not lose sight of his intention. He saw metaphysics since Plato as an ungracious power trip. Man saw his environment as contingent trash. His "ontotheology" led him to as obsession with epistemology, one that ultimately leads to pragmatism. How? Because the skeptic cannot be answered well except by pragmatism. The only thing we can know with certainty is our desires. Nietzsche is the inversion of Plato, in H's eyes. Hidden eternal truth is flipped until truth is an army of metaphors in the service of an imperious Will.