Mathematics knows no races or geographic boundaries; for mathematics, the cultural world is one country.

Every child should have mud pies, grasshoppers, water bugs, tadpoles, frogs, mud turtles, elderberries, wild strawberries, acorns, chestnuts, trees to climb, brooks to wade in, water lilies, woodchucks, bats, bees, butterflies, various animals to pet, hayfields, pine-cones, rocks to roll, sand, snakes, huckleberries and hornets; and any child who has been deprived of these has been deprived of the best part of education.

一切事物都完备地存在于我心中。反观自身而达到真诚，快乐没有比这更大的了。