Full Idea
Fluidity is the fundamental condition, and the division into bodies is carried out - there being no obstacle to it - according to our need.
Gist of Idea
Fluidity is basic, and we divide into bodies according to our needs
Source
Gottfried Leibniz (New Essays on Human Understanding [1704], 2.13)
Book Reference
Leibniz,Gottfried: 'New Essays on Human Understanding', ed/tr. Remnant/Bennett [CUP 1996], p.151
A Reaction
Leibniz is referring to what he usually calls 'aggregates', like piles of bricks, which are things lacking a unifying substance. There may be no true substances, in which fluidity is the order of the day.