John Dewey:
The very problem of mind and body suggests division; I do not know of anything so disastrously affected by the habit of division as this particular theme. In its discussion are reflected the splitting off from each other of religion, morals and science; the divorce of philosophy from science and of both from the arts of conduct. The evils which we suffer in education, in religion, in the materialism of business and the aloofness of "intellectuals" from life, in the whole separation of knowledge and practice -- all testify to the necessity of seeing mind-body as an integral whole.
Oliver Goldsmith:
Logicians have but ill defined
As rational the human mind.
Logic, they say, belongs to man,
But let them prove it if they can.
Ralph Waldo Emerson:
Nothing is at last sacred but the integrity of your own mind.