What was the group they found? That all apples fell, so they called it "gravitation". Now we see that without a fund of already existing experience, any new experience would be impossible, for there would be nothing to which to refer the new impression. So, if, as some of the European philosophers think, a child came into the world with what they call tabula rasa, such a child would never attain to any degree of intellectual power, because he would have nothing to which to refer his new experiences. We see that the power of acquiring knowledge varies in each individual, and this shows that each one of us has come with his own fund of knowledge. Knowledge can only be got in one way, the way of experience; there is no other way to know. If we have not experienced it in this life, we must have experienced it in other lives. How is it that the fear of death is everywhere? A little chicken is just out of an egg and an eagle comes, and the chicken flies in fear to its mother. There is an old explanation (I should hardly dignify it by such a name). It is called instinct. What makes that little chicken just out of the egg afraid to die? How is it that as soon as a duckling hatched by a hen comes near water, it jumps into it and swims? It never swam before, nor saw anything swim. People call it instinct. It is a big word, but it leaves us where we were before.