Heidegger’s "Letter on Humanism" (1949) is perhaps his clearest statement from after his famous "turn" which involved an increased interest in the role of language–in particular poetry–in relating us to Being.
While Heidegger denies being a "humanist", he maintains that philosophy does make one more humane. He also represents an interesting contrast to system-building and all "isms" in which (to him) real thinking has come to an end. For Heidegger, it is language itself that is the "house of Being," that enables the poet or philosopher, through careful uses of it (aka, real thinking), to be a "guardian" of this house.
In this way, we return to doing philosophy like the Greeks, whom he claims simply "just did philosophy" without even calling it such.
essay here: http://archive.org/details/HeideggerLetterOnhumanism1949
"It is time to break the habit of overestimating philosophy and of thereby asking too much of it. What is needed
in the present world crisis is less philosophy, but more attentiveness in thinking; less literature, but more cultivation of the letter. The thinking that is to come is no longer philosophy, because it thinks more originally than metaphysin- a name identical to philosophy. However, the thinking that is to come can no longer, as Hegel demanded, set aside the name "love of wisdom" and become wisdom itself in the form of absolute knowledge. Thinking is on the descent to the poverty of its provisional essence. Thinking gathers language into simple saying. In this way language is the language of being, as clouds are the clouds of the sky".