"I consequently knew as much about religion as was possible for a child of my age. I even knew more, for why should I conceal my thoughts? My childhood was not that of a child; I always felt and thought as a man. It was only when I grew up that I re-entered the class of ordinary individuals; as a child I did not belong to it. The reader will laugh to find me modestly representing myself as a prodigy. So be it; but when he has laughed sufficiently, let him find a child who, in his sixth year, is so attracted, interested and carried away by romances as to shed hot tears over them; then I shall feel that my vanity is ridiculous, and will confess that I am wrong. If I have said that we ought not to speak about religion to children, if we wish them to possess any, and, further, that they are incapable of knowing God, even according to our ideas, I have drawn this conviction from my observations, not from my own experience, for I knew that no conclusion could be drawn from it in regard to others. Find me Jean-Jacques Rousseaus of six years old, and speak to them of God when they are seven; I will guarantee that you run no risk."
January 1, 1970
https://en.wikiquote.org/wiki/Confessions_(Rousseau)