Full Idea
We act when something in us or outside us follows from our nature, which can be clearly and distinctly understood through this alone.
Gist of Idea
We act when it follows from our nature, and is understood in that way
Source
Baruch de Spinoza (The Ethics [1675], III Def2)
Book Reference
Spinoza,Benedict de: 'Ethics', ed/tr. Curley,Edwin [Penguin 1996], p.70
A Reaction
I like this, because it links actions to our essential natures, and because it focuses on understanding the action, which must involve explaining the action. This is the root of responsibility, not something called 'free will'. BUT SEE 17202.