When a child asks you something, answer him, for goodness sake. But don't make a production of it. Children are children, but they can spot an evasion faster than adults, and evasion simply muddles 'em.
When we are unhurried and wise, we perceive that only great and worthy things have any permanent and absolute existence, that petty fears and petty pleasures are but the shadow of the reality.
Anyone who cannot cope with mathematics is not fully human. At best, he is a tolerable subhuman who has learned to wear his shoes, bathe, and not make messes in the house.