A human child is at the most learning age of the most learning species that has yet evolved on this planet.

We learn in a variety of ways. Some of these, such as operant conditioning and habit learning, we share with other animals. But one of these ways is unique to man-to homo sapiens: not just the naked ape, as a zoologist (Morris, 1967) has called us, but the understanding ape-the ape with the potential for knowledge, even wisdom. The extent to which this potential is realised will depend, for each individual, on how he develops the intelligence with which he is born, just by virtue of being human.