PS - a person THINKS DEEP when she wants to SOLVE A PROBLEM. If you look onto a single object for one hour or more, you will notice things that were not immediately evident. If you want to drink tea, you have to make water boil.
Much classic [and some modern] writing could make you think deeply, though many may not be available in Chinese translation.
Try 'The Secret Garden' by Frances Hodgson Burnett, ostensibly a children's novel, which you could read in English.
I'd love to but I'm also an English learner lol. We could help each other :)