It is a profoundly erroneous truism, repeated by all copy-books and by eminent people when they are making speeches, that we should cultivate the habit of thinking of what we are doing. The precise opposite is the case. Civilization advances by extending the number of important operations which we can perform without thinking about them.
Alfred North Whitehead
A brilliant thought by Alfred North Whitehead from his book An Introduction to Mathematics (1911). This poweful quote reminded me to recommend you this other article from the New York Times article about the progress of technology and the problems it raises.