I have often told people that they need to evaluate their lives by the video, and not by the snapshot. That is, they should not just look at one moment in time, but rather consider trajectories, tendencies, and narrative arc as well.
Quotes shape us, whether it's from a book, tv show/movie, song lyrics, or another individual. Quotes are based off of other people's experiences, thoughts and perceptions. Whether you realize it or not, we all learn from each other. We all have experienced the same situations in one way or another; we can all relate.