The quote implies that the philosophical ideas of Plato, one of the most influential figures in Western philosophy, have largely gone unchallenged for over two millennia. Plato’s theories, including his views on politics, ethics, and metaphysics, among others, have been widely accepted and have significantly influenced Western thought and culture.

This lack of opposition could be attributed to the profound impact of Plato’s ideas on various fields of study. His theories on the nature of reality, justice, and the ideal state, for instance, have shaped political theory, ethics, and metaphysics. However, this doesn’t necessarily mean that his ideas are infallible or beyond critique. Rather, it suggests that they have been so influential and deeply entrenched in Western thought that they’ve become almost foundational, shaping the way we think about these concepts.

Applying this to today’s world, we can see Plato’s influence in various aspects of society. For example, his idea of the "Philosopher King" – a leader who loves wisdom and is just and knowledgeable – is still relevant in discussions about the qualities of good leadership. His metaphysical theories, such as the Theory of Forms, continue to influence philosophical debates about the nature of reality.

In terms of personal development, Plato’s ideas about the pursuit of knowledge and wisdom can be motivating. His belief in the importance of self-reflection and striving for a balanced, virtuous life can guide personal growth. However, the lack of opposition to his ideas also serves as a reminder to question and critically examine even the most widely accepted beliefs and theories. Just because an idea has been around for a long time and has been largely unchallenged doesn’t mean it’s necessarily right or the only way to see things. It encourages intellectual curiosity, critical thinking, and the courage to challenge established ideas.