This quote underscores the inherent value of freedom of thought and action in a democratic society. In essence, it suggests that democracy, at its core, is designed to protect and uphold the rights of individuals to form and voice their own opinions, as well as to act upon them. Democracy is not just about the majority rule, but also about safeguarding the rights and freedoms of the minority. This is what is meant by “jealously guarded” – the system should fiercely protect these rights, not allowing them to be infringed upon.

In today’s world, this concept is incredibly relevant. With the advent of social media and the digital age, the freedom of opinion has become even more crucial. However, it’s also become more complex. While everyone has the right to voice their opinion, it’s become increasingly important to balance this with the responsibility of not spreading misinformation or hate speech. Hence, the ‘jealous guarding’ of individual liberty of opinion should also incorporate the responsibility of using this freedom wisely and ethically.

In terms of personal development, this quote can be interpreted as a call to value and protect one’s own freedom of thought and action. It encourages individuals to form their own opinions, rather than blindly following the majority. It also emphasizes the importance of standing up for one’s rights and taking action based on personal beliefs. In this context, the ‘jealous guarding’ could mean being vigilant about not letting external influences unduly affect one’s decisions and actions. This is a key aspect of personal growth – learning to think independently and act in accordance with one’s values.