Full Idea
In the mutual agreement of perceivers consists the truth of the phenomena.
Gist of Idea
Truth is mutually agreed perception
Source
Gottfried Leibniz (Letters to Des Bosses [1715], 1716.05.29)
Book Reference
Leibniz,Gottfried: 'Philosophical Essays', ed/tr. Arlew,R /Garber,D [Hackett 1989], p.206
A Reaction
This remark is startling close to the 'perspectivism' that crops up in the late notebooks of Nietzsche. Leibniz was keen on relativism in many areas, starting with the nature of space. I personally think Leibniz meant 'knowledge' rather than 'truth'.