This process, this method necessary to man's survival and prosperity upon the earth, has often been derided as unduly or exclusively "materialistic." But it should be clear that what has happened in this activity proper to man's nature is a fusion of "spirit" and matter; man's mind, using the ideas it has learned, directs his energy in transforming and reshaping matter into ways to sustain and advance his wants and his life. Behind every "produced" good, behind every man-made transformation of natural resources, is an idea directing the effort, a manifestation of man's spirit.