The most evident token and apparent sign of true wisdom is a constant and unconstrained rejoicing.

This quote suggests that the most visible indication of true wisdom is a consistent and unrestricted joy. In other words, genuine wisdom brings about a state of constant happiness or contentment that is not bound by circumstances. This doesn’t mean being always outwardly happy, but rather having an inner peace and joy that remains steady regardless of external situations.

The “unconstrained” aspect implies this joy isn’t forced or faked—it’s a natural result of true wisdom. It emanates from understanding life’s complexities, accepting them, and still finding reasons to be joyful. Wisdom here is seen as the ability to navigate life with grace, understanding its ups and downs but not allowing them to steal one’s joy.

Applying this in today’s world or personal development means striving for wisdom over superficial knowledge. In an age dominated by information overload, it can be easy to mistake knowledge for wisdom. But while knowledge pertains to the accumulation of facts and data, wisdom involves discerning what those facts mean on a deeper level and applying them in ways that contribute positively to our lives.

In terms of personal development, it means focusing on growth areas that foster true wisdom – like emotional intelligence, empathy, resilience – rather than just factual knowledge acquisition. It also involves cultivating attitudes such as positivity amidst adversity which leads to “constant rejoicing”.

For instance in dealing with failure instead of wallowing in disappointment – which is a typical response – recognizing it as an opportunity for learning shows application of this principle; hence leading you towards ‘unconstrained rejoicing’.

Overall Montaigne suggests that when we possess true wisdom we are able maintain a state of happiness no matter what life throws at us because we understand the transient nature of all experiences – both good and bad – thus maintaining our equilibrium.