The quote suggests that some ideas can be difficult to defend due to their complexity or perceived excessiveness. Embracing such concepts can make one feel embarrassed because they require considerable effort and energy to justify. Instead, there are ideas that are inherently valuable and progressive, which naturally justify themselves and resonate with people without needing extensive defense.

This notion highlights the tension between simplicity and complexity in ideas. While some thoughts may seem innovative and progressive, they can also face scrutiny and challenge, while others that are straightforward thrive on their own merit. Kundera's observation emphasizes the importance of clarity and resonance in the ideas we choose to embrace and present to the world.