"Revenge... is like a rolling stone, which, when a man hath forced up a hill, will return upon him with a greater violence, and break those bones whose sinews gave it motion"

This quote by Albert Schweitzer is a warning about the effects of looking for revenge. It is stating that vengeance resembles a wanderer, which, when risen a hill, will come back down with much more force and cause more damage than it did when it was pushed up. This is a metaphor for how revenge can backfire and cause more damage than great. It is a pointer that revenge is not a good option to an issue which it can often result in more pain and suffering. The quote is a suggestion that it is better to forgive and move on than to seek revenge, as it can often result in more discomfort and suffering in the long run.