Full Idea
By God, I understand Being absolutely infinite, that is to say, substance consisting of infinite attributes, each one of which expresses eternal and infinite essence.
Gist of Idea
God is a substance with infinite attributes
Source
Baruch de Spinoza (The Ethics [1675], I Def 6)
Book Reference
Spinoza,Benedict de: 'Ethics', ed/tr. White,WH/Stirling,AH [Wordsworth 2001], p.3