Did then a single power of my soul remain unexercised?

那么魂有没有一点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.

他有一个儿子——一个长得太大人，有着孩子锻炼智力，他以这种奇怪式抚养他，以免他受到诱惑和错误。