"When a torrent sweeps a man against a boulder, you must expect him to scream, and you need not be surprised if the scream is sometimes a theory"

This quote by Robert Louis Stevenson is a metaphor for the human experience. It suggests that when life throws us a curveball, it is natural to react with a loud outcry. This outcry can take the form of a physical scream, or it can be a more abstract expression of our feelings, such as a theory or concept. Simply put, when we are confronted with a difficult situation, it is natural to express our feelings in whatever method we can. The quote likewise suggests that we should not be shocked when someone expresses their sensations in a special way, as it is a natural response to a difficult situation. Eventually, this quote is a tip that it is okay to express our emotions, even if it is not in a conventional way.