I am reading Karl Jasper’s Way to Wisdom, an introduction to philosophy. From page 9:
A marvelous indication of man’s innate disposition to philosophy is to be found in the questions asked by children. It is not uncommon to hear from the mouths of children words which penetrate to the very depths of philosophy.
From page 10:
Children often possess gifts which they lose as they grow up. With the years we seem to enter into a prison of conventions and opinions, concealments and unquestioned acceptance, and there we lose the candor of childhood. The child still reacts spontaneously to the spontaneity of life; the child feels and sees and inquires into things which soon disappear from his vision. He forgets what for a moment was revealed to him and is surprised when grownups later tell him what he said and what questions he asked.
Child psychologist have noted this too, and something else – that children soon learn to lie and to become destructive and vicious.