Alain Badiou offers a tour de force encounter with a lesser-known seventeenth-century philosopher and theologian, Nicolas Malebranche, a contemporary and peer of Spinoza and Leibniz. The seminar is at once a record of Badiou's thought at a key moment and a lively interrogation of Malebranche's key text, the Treatise on Nature and Grace. Malebranche is Badiou's most richly theological work . . . Like nearly all of Badiou's writing, it is conceptually difficult and challenging, but immensely rewarding.