Full Idea
The universe contains everything that its perfect harmony could admit.
Gist of Idea
The universe contains everything possible for its perfect harmony
Source
Gottfried Leibniz (New Essays on Human Understanding [1704], 3.06)
Book Reference
Leibniz,Gottfried: 'New Essays on Human Understanding', ed/tr. Remnant/Bennett [CUP 1996], p.307
A Reaction
This sort of Leibnizian remark leaves most modern readers, including me, totally bewildered. The claim depends entirely on the perfect nature of God.