He could not construct for the child's pleasure the world he'd lost without constructing the loss as well and he thought perhaps the child had known this better than he.
Nature has not placed us in an inferior rank to men, no more than the females of other animals, where we see no distinction of capacity, though I am persuaded if there was a commonwealth of rational horses... it would be an established maxim amongst them that a mare could not be taught to pace.
The secret of being miserable is to have leisure to bother about whether you are happy or not. The cure for it is occupation, because occupation means pre-occupation; and the pre-occupied person is neither happy nor unhappy, but simply alive and active. That is why it is necessary to happiness that one should be tired.