In the Port‐Royal Logic, Arnauld and Nicole argue that eloquence plays a crucial role in the cultivation of the art of thinking. In this essay, we demonstrate that Arnauld and Nicole's reflections on eloquence exemplify the need to reconceive the larger framework in which Cartesian theories of ideas operate. Instead of understanding epistemic agents as solitary thinkers who pursue their intellectual goals without the influence of others, our analysis shows that for Arnauld and Nicole thinking well was an intersubjective discursive (...) activity that unfolds between complexly organized persons. Central to this activity is the ability to gauge the affective and associative tendencies of interlocutors and to communicate accordingly. This ability is required to enable speakers to deal constructively with problems arising from the context sensitivity of language, the influences of the passions, and the audience's capacity to decipher meaning in the communication of ideas that facilitate understanding and knowledge. By drawing attention to communication, affect, and association in the Port‐Royal Logic, we show that there is a significant connection between thinking and expressing oneself well in the early modern period. (shrink)