Walt Whitman...

Here is the test of wisdom,
Wisdom is not finally tested in schools,
Wisdom cannot be passed from one having it to another
not having it,
Wisdom is of the soul, is not susceptible of proof, is its own proof,
Applies to all stages and objects and qualities and is content,
Is the certainty of the reality and immortality of things, and the
excellence of things; Something there is in the float of the sight
of things that provokes it out of the soul.
Now I re-examine philosophies and religions,
They may prove well in lecture-rooms, yet not prove at all under
the spacious clouds and along the landscape and flowing currents.