Full Idea
The mind is subject to passions in proportion to the number of inadequate ideas which it has.
Gist of Idea
Minds are subject to passions if they have inadequate ideas
Source
Baruch de Spinoza (The Ethics [1675], III Pr 01)
Book Reference
Spinoza,Benedict de: 'Ethics', ed/tr. White,WH/Stirling,AH [Wordsworth 2001], p.100
A Reaction
An exceptionally intellectualist view of emotions!