As a result of letting the drive for power dominate existence, man is bound to lose his sense for nature's otherness. Nature becomes a utensil, an object to be used. The world ceases to be that which is and becomes that which is available.
It is a submissive world that modern man is in the habit of sensing, and he seems content with the riches of thinghood. Space is the limit of his ambitions, and there is little he desires besides it. Correspondingly, man's consciousness recedes more and more in the process of reducing his status to that of a consumer and manipulator. He has enclosed himself in the availability of things, with the shutters down and no sight of what is beyond availability.

Ch. 5. - Who Is Man? (1965)