Full Idea
Wisdom is the science of happiness.
Gist of Idea
Wisdom is the science of happiness
Source
Gottfried Leibniz (Letters to Antoine Arnauld [1686], 1690.03.23)
Book Reference
Leibniz,Gottfried: 'The Leibniz-Arnauld Correspondence', ed/tr. Mason,HT/Parkinson,GHR [Manchester UP 1967], p.171
A Reaction
That probably comes down to common sense, or Aristotle's 'phronesis'. I take wisdom to involve understanding, as well as the quest for happiness.