"Why do you underline certain sentences in a book?"

When I am reading a book, I enjoy underlining certain phrases. The phrases I underline are things that I find important and meaningful. Sometimes the sentence, or sentences, are pretty simple, but I can relate to them in a whole different level. When I write my book, I want people to find these type of phrases and for the phrases to stick with them whenever they are having a hard time. I love turning these phrases into quotes and writing them down in my journal and journaling about them. It’s important for me not to underline the a lot of phrases because if I do underline a lot, then the meaning of underlining loses its meaning and value. Personally, I believe this should not mean that I am annotating because annotation is way different from underlining. In a way, underlining is just lazy annotating. It’s more for fun rather than force.