This is from a book that I was reading a few weeks ago. “A parent’s love for a child is a significant human experience, but psychologists do not possess sensitive ways to measure the intensity of this emotion accurately.” By Jerome Kagan, 2007, p. 44 An Argument for Mind.

We have discovered or invented many instruments and scientific methods to measure phenomena found in nature and in other human experiences. Indeed, many natural and human phenomena can be measured accurately by social and natural scientists but not emotion — “a parent’s love for a child,” which is deeper than the ocean and higher than the sky. It is crucial to human existence but probably not scientifically as important as we think.