The idea of an external conscious being is unavoidably suggested, as it seems to me, by the categorical imperative of the moral sense; and moreover in a way quite independent, by the aspect of nature, which seems to answer to our questionings with an intelligence akin to our own.
"The Old Riddle and the Newest Answer"
John Gerard
But the counterpart of this must not be forgotten, that every categorical proposition applies to an individual.
"John Dewey's logical theory"
Delton Thomas Howard
But similarly, every moral experience recognizes what Kant calls the categorical imperative.
"The Approach to Philosophy"
Ralph Barton Perry