In this text, the most systematic exposition of Malebranche's philosophy, he presents clear and comprehensive statements of his two best-known contributions to metaphysics and epistemology, namely, the doctrines of occasionalism and vision in God. This edition presents a translation of the text that is clear, readable and more accurate than any of its predecessors, together with an introduction that analyzes Malebranche's central teachings and explains the importance of the Dialogues in the context of seventeenth-century philosophy.