“This is the best of all possible worlds.” (Gottfried Leibniz)
A mind closed upon itself sees no possibilities beyond what she think she knows.
An mind opened to the possibility of learning something new every day, all the time, expands the knowledge horizon. And even if she is unable to see beyond, she knows there is something more worth exploring.
We live in the best of all possible worlds if we keep our mind open to the realm of possibility.