Did then a single power of my soul remain unexercised?

那么我灵魂有没有力量没有发挥出来呢？

He had a son — an overgrown man with the unexercised intellect of a child, whom he had kept up in that strange way, in order to save him from temptation and error.

他有个儿子——个长得太大，有着孩子般未经锻炼智力，他以这种奇怪式抚养他，以免他受到诱惑和错误。