People usually think it not bad for man to be the lord of the earth. Man is supposed to be the center of the world; if he be subjected to nature he is alienated or reified. Although people have seen from man’s controlling nature some unexpected results, such as pollution of the environment, loss of ecological balance, and so on, usually they think that these unexpected problems resulting from technology can also be resolved by means of technology. But, will rectified nature be the same one in which human beings and other living things primordially came to be? If not, why in practice could man not prevent those results beforehand; perhaps man is driven by some unknown force.
If a disadvantage is caused by man’s fault, such as alienation, it could be corrected or remedied by man’s own effort. But when a danger comes from destiny it could not be avoided merely by man. What man could do is not to give up technology, but to "keep watch over the unconcealment -- and with it, from the first, the concealment -- of all coming to presence in the earth." That is to say, man should take technology not only as an instrument at hand, but as a way of revealing. It is a way for human beings to recover their own dignity: man is the shepherd of the destiny of Being.
