This causality of reason we do not regard as a co-operating agency, but as complete in itself.
"The Critique of Pure Reason" by Immanuel Kant
It is true that he apparently rejected altogether the causal agencies alleged by earlier inquirers.
"Essays: Scientific, Political, & Speculative, Vol. I" by Herbert Spencer
In all this the agencies or forces causally at work in the economic life process are neatly avoided.
"The Place of Science in Modern Civilisation and Other Essays" by Thorstein Veblen