This quote suggests that while there are certain principles or ideals that one might be so passionate about that they would willingly give their life for them, there are no causes that justify taking another person’s life. It emphasizes the value and sanctity of life and the importance of non-violence. It also implies that our own lives are the only ones we have true control over, and thus the only ones we should be willing to sacrifice for a cause.

In the context of today’s world, this quote could be interpreted as a critique of war and violence. It could be applied to the numerous conflicts around the globe where lives are lost in the name of various causes, be it political, religious, or ideological. The quote suggests that while it’s admirable to be passionate about a cause, it’s not worth killing others to achieve it. This is a call to solve disputes through peaceful means rather than resorting to violence.

In terms of personal development, this quote could be a reminder to value the lives and perspectives of others, even when they conflict with our own. It encourages us to stand up for what we believe in, even if it means making personal sacrifices, but not at the expense of others’ lives or well-being. It could also be seen as a call to practice empathy and understanding, and to strive for peaceful resolutions in our personal and professional relationships.