In Romeo and Juliet Friar Lawrence tells them to “love moderately”. I think he means that they need to understand that they caught feelings for each other so fast and that they may not have those feelings for each other always. They are so young and everything happens so fast. Everything can end just as fast and they need to be ready for that. I don’t think that they really take that advice because they are so young and don’t really care they are just being in the moment and just want to get married already.