Full Idea
Wisdom, theoretically regarded, means the knowledge of the highest good and, practically, the conformability of the will to the highest good.
Gist of Idea
Wisdom is knowing the highest good, and conforming the will to it
Source
Immanuel Kant (Critique of Practical Reason [1788], I.II.II.V)
Book Reference
Kant,Immanuel: 'Critique of Practical Reason (Third edition)', ed/tr. Beck,Lewis White [Library of Liberal Arts 1993], p.137
A Reaction
This seems a narrow account of wisdom, focusing entirely on goodness rather than truth. A mind that valued nothing but understood everything would have a considerable degree of wisdom, in the normal use of that word.