This quote suggests that while force or power may govern the world, it is opinion or belief that drives and directs that force. In essence, it’s an exploration of the relationship between power and ideas. Power, in this context, can be understood as tangible and immediate, like military might or economic strength. Opinion, on the other hand, is more intangible and long-term, shaping our values, beliefs, and motivations.

The first part of the quote, "The world is ruled by force, not by opinion," acknowledges the reality that those with power often have the ability to dictate outcomes. However, the second part, "but opinion uses force," brings in the idea that power is not self-directing. It is guided by the opinions, beliefs, and values of those who wield it.

Applying this to today’s world, we can see this dynamic at play in various arenas. For example, in politics, politicians might have the force (i.e., the authority or legislative power), but it’s the opinion of the masses (i.e., public sentiment or popular opinion) that guides how they use their power. A politician may have the power to enact laws, but they are often swayed by public opinion, using their power in ways that align with popular sentiment to maintain their position.

In terms of personal development, this quote can be interpreted as a call to be aware of the power of our own opinions and beliefs. Our opinions can drive our actions, which in turn can have a significant impact on our lives and the world around us. Therefore, it’s essential to critically examine our opinions, ensuring they are well-informed and constructive. This way, the "force" or actions we take driven by these opinions will lead to positive outcomes.