C G Jung

On materialism and spirit from the book  Four Archetypes

"....Spirit threatens the naive-minded man with inflation, of which our own times have given us the most horribly instructive examples. The danger becomes all the greater the more our interest fastens upon external objects and the more we forget that the differentiation of our relation to nature should go hand in hand with a correspondingly differentiated relation to the spirit, so as to establish the necessary balance. If the outer object is not offset by an inner, unbridled materialism results, coupled with maniacal arrogance or else the extinction of the autonomous personality, which is in any case the ideal of the totalitarian mass state."