For Martin Heidegger broadly, the question of being formed the essence of his philosophical inquiry. In The Question Concerning Technology (Die Frage nach der Technik), Heidegger sustains this inquiry, but turns to the particular phenomenon of technology, seeking to derive the essence of technology and humanity’s role of being with it.
Man is the shepherd of Being. It is in this direction alone that Being and Time is thinking when ecstatic existence is experienced as "care."
The setting-into-work of truth thrusts up the awesome and at the same time thrusts down the ordinary and what we believe to be such.
In the creation of a work [of art], the strife, as rift, must be set back into the earth, and the earth itself must be set forth and put to use as self-secluding. Such use, however, does not use up or misuse the earth as matter, but rather sets it free to be nothing but itself.
The technological framework is inherently expansionist and can reveal only by reduction. It's attempt to enclose all beings in a particular claim--utter availability and sheer manipulability--Heidegger calls Ge-stell, "enframing." As the essence of technology, enframing would be absolute. It would reduce man and beings to a sort of "standing reserve" or stockpile in service to, and on call for, technological purposes.
[The Object] disappears into usefulness. The material is all the better and more suitable the less it resists vanishing.
... everything that man encounters exists only insofar as it is his construct… man everywhere and always encounters only himself.
[Enframing] puts to nature the unreasonable demand that it supply energy which can be extracted and stored as such.
[In revealing] One being places itself in front of the latter, a few obstruct many, one denies all.
Technology is not demonic… The essence of technology as a destining of revealing, is the danger.