- Lived:
- 1632–1677 · Amsterdam, Rijnsburg, Voorburg, The Hague
- Tradition:
- Dutch Golden Age rationalism; the great heretic of the seventeenth century
- The Big Idea:
- There is only one infinite substance — call it God, call it Nature — and everything, including you, is a mode of it; freedom is not escaping necessity but understanding it.
- In their words:
- "All things excellent are as difficult as they are rare."
- If you remember one thing:
- Excommunicated at twenty-three with the fiercest curse his community could write, he ground lenses for a living, refused a professorship to stay free, and built — proposition by proposition, like geometry — the most radical philosophical system of his century.