@ZipLine-- I think this is in act 1 and it is a metaphor: "Kind gentlemen, your pains are register'd, where every day I turn
the leaf to read them."
Here, Shakespeare is talking about memory. He is referring to his memory as a kind of book where he has registered everyone's pains. He "reads" them every day, meaning that he remembers them every day.
Sometimes, a sentence with a metaphor doesn't use "like" or "as" to tie the two ideas together. But when you see a word or idea that seems out of place or different, it might be a sign that a metaphor is being used. It doesn't make sense that someone's pain be registered in a book, right? So from there, you can think about where people's experiences and pains may be stored, which is memory.
Some writers are exceptional at using metaphor, like Shakespeare. So don't be disheartened. Read it more carefully and think about the words used.