The abolition of private property is, doubtless, the shortest and most significant way to characterize the revolution in the whole social order which has been made necessary by the development of industry – and for this reason it is rightly advanced by communists as their main demand. Friedrich Engels
You all know how powerful and varied are the effects of which steam engines are capable; with them has really begun the great development of industry which has characterised our century before all others. Hermann von Helmholtz