[Here](https://en.wikipedia.org/wiki/Eastern_philosophy#Controversy) it is said that Heidegger viewed German and Greek as the only languages in which doing philosophy is possible at all. 

The article references several sources [I won't list them to save space] I don't have any access to. If someone has these sources, please provide the argument from Heidegger supporting the claim.

For those who know a lot about Heidegger's thought, any educated guesses about what the argument (arguments?) might have been would be greatly appreciated.