Full Idea
I am by no means asserting that gravity is essential to bodies.
Gist of Idea
I am not saying gravity is essential to bodies
Source
Isaac Newton (Principia Mathematica [1687], Bk 3 Rule 3)
Book Reference
Newton,Isaac: 'Philosophical Writings' [CUP 2004], p.88
A Reaction
Notice that in Idea 17009 he does not rule out gravity being essential to bodies. This is Newton's intellectual modesty (for which he is not famous).
Related Idea
Idea 17009 I won't object if someone shows that gravity consistently arises from the action of matter [Newton]