If you are you, 24 hours a day, then you do not have to remember who you are supposed to be in different situations - something that I imagine could be troublesome. ↗
My mother used to tell me, “Things always look worse at night.” For the most part, I believe her. But some of the troubles that keep me from sleeping look just as bad in the morning. ↗
He who knows no hardships will know no hardihood. He who faces no calamity will need no courage. Mysterious though it is, the characteristics in human nature which we love best grow in a soil with a strong mixture of troubles. ↗
Books can also provoke emotions. And emotions sometimes are even more troublesome than ideas. Emotions have led people to do all sorts of things they later regret-like, oh, throwing a book at someone else. ↗