Brain power improves by brain use, just as our bodily strength grows with exercise. And there is no doubt that a large proportion of the female population, from school days to late middle age, now have very complicated lives indeed.
At fifteen, my mind was bent on learning.
At thirty, I stood firm.
At forty, I had no doubts.
At fifty, I knew the decrees of Heaven.
At sixty, my ear was receptive to truth.
At seventy, I could follow my heart's desires without sin.