What makes writing worth reading?

What makes writing worth reading? I think this is a really complex question to answer. I guess the main reason it is worth reading is because it is how we learn. We can learn without reading, but writing makes it so much easier and accessible. Writing is worth reading because we haven't always had a form of written language. Stories and lessons were passed down from generation to generation by word of mouth. Now that we have writing, everything is more accurate and we are able to remember details that at one point would have been lost. So many great lessons can be learned from reading.
I think certain writings are worth reading over others. I have different opinions on what is worth reading than other people. I think placing worth on writings is a very individual thing and I think that is part of the reason writing is worth reading. Everyone can write about what they feel is important and people can choose to read what they think it worth reading. Although I feel that certain works are more important to read than others, some people may disagree.
Even though I might not think something is worth reading, it was worth it for someone to write it, and that counts for something. I think all writing is worth reading because someone took the time to write it.