Full Idea
Wisdom is a perfect knowledge of the principles of all the sciences and of the art of applying them.
Gist of Idea
Wisdom is knowing all of the sciences, and their application
Source
Gottfried Leibniz (On Wisdom [1693], 0)
Book Reference
Leibniz,Gottfried: 'Leibniz Selections', ed/tr. Wiener,Philip P. [Scribners 1951], p.77
A Reaction
'Sciences' should be understood fairly broadly here (e.g. of architecture, agriculture, grammar). This is a scholar's vision of wisdom, very different from the notion of the wisest person in a village full of illiterate people.