Full Idea
The common notion of 'contingency' is for Spinoza an illusion, which derives from the fact that our view of reality is often inadequate and incomplete.
Gist of Idea
Contingency is an illusion, resulting from our inadequate understanding
Source
report of Baruch de Spinoza (The Ethics [1675]) by John Cottingham - The Rationalists p.8
Book Reference
Cottingham,John: 'The Rationalists' [OUP 1988], p.8
A Reaction
The crux is if there could another universe with different natural laws. Spinoza is in no position to deny the possibility. Cosmologists assume it is possible, and run computer simulations to test it. There is 'metaphysical' and 'natural' necessity.