“Scientific investigation is rapidly putting at our disposal vast amounts of knowledge concerning materials and forces, which it is the business of the engineer to utilize for the benefit of the community. Well-designed plants and efficiency labor-saving devices, to be seen on every hand, bear testimony that he is doing at least a portion of his work well. When, however, it comes to the operation of these plants and the utilization of these labor-saving devices, the lack of co-operation between employer and employee, and the inefficient utilization of labor, very much impair their efficiency. The increase of this efficiency is essentially the problem of the manager, and the amount to which it can be increased by proper study is, in most cases, so great as to be almost incredible.”

Introduction to the 2002 Edition, p. xi.
The Design of Everyday Things (1988, 2002)

"The Challenge of Renewal"
The Conduct Of Life (1951)

Source: Principles of industrial organization, 1913, p. 48

Report on Manufactures (1791)
Context: It merits particular observation, that the multiplication of manufactories not only furnishes a Market for those articles, which have been accustomed to be produced in abundance, in a country; but it likewise creates a demand for such as were either unknown or produced in inconsiderable quantities. The bowels as well as the surface of the earth are ransacked for articles which were before neglected. Animals, Plants and Minerals acquire an utility and value, which were before unexplored.

Spoke on the occasion of the Economic Conference held during Dussera festival 1911 which brought wide awareness of the people on the effectiveness of Cooperative Societies. Modern_Mysore, Dr. B. R. Ambedkar Open University, 26 November 2013, archive.org, 206-07 http://archive.org/stream/modernmysore035292mbp/modernmysore035292mbp_djvu.txt,
As ruler of the state

Introduction
Small Houses: Their Economic Design and Construction (1922)

Source: Morals and Dogma of the Ancient and Accepted Scottish Rite of Freemasonry (1871), Ch. XIX : Grand Pontiff, p. 316
Context: If not for slander and persecution, the Mason who would benefit his race must look for apathy and cold indifference in those whose good he seeks, in those who ought to seek the good of others. Except when the sluggish depths of the Human Mind are hroken up and tossed as with a storm, when at the appointed time a great Reformer comes, and a new Faith springs up and grows with supernatural energy, the progress of Truth is slower than the growth of oaks; and he who plants need not expect to gather. The Redeemer, at His death, had twelve disciples, and one betrayed and one deserted and denied Him. It is enough for us to know that the fruit will come in its due season. When, or who shall gather it, it does not in the least concern us to know. It is our business to plant the seed. It is God's right to give the fruit to whom He pleases; and if not to us, then is our action by so much the more noble.

Source: Philosophy, Science and Art of Public Administration (1939), p. 661