"The deeper we look, the more we shall be convinced that the one thing wanting, which we must strive to acquire before all others, is strength strength physical, strength mental, strength moral, but above all strength spiritual which is the one inexhaustible and imperishable source of all the others. If we have strength everything else will be added to us easily and naturally."

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In certain circumstances where he experiments in new types of conduct by cooperating with his equals, the child is already an adult. There is an adult in every child and a child in every adult. ... There exist in the child certain attitudes and beliefs which intellectual development will more and more tend to eliminate: there are others which will acquire more and more importance. The later are not derived from the former but are partly antagonistic to them.

— Jean Piaget