From 1683 to 1685 Arnauld engaged in a controversy with Malebranche over the nature of ideas. While the occasion for the dispute was a disagreement over grace, the focus was the account of ideas given in Malebranche’s Search After Truth. Arnauld published his Des vraies et des fausses idées in 1683, and this was followed by a response from Malebranche in 1684 and a response by Arnauld shortly afterward. In his criticism of Malebranche, Arnauld claimed to be reacting not just (...) for himself, but for Descartes as well, and so a look at the controversy and the reasons given for the conflicting claims will, I believe, help in understanding Descartes’ own difficult remarks on ideas. (shrink)