The interpreters divided Hume's philosophy, his "logic," into two parts: the destructive part would be composed of his philosophical analyses, his critique of rationalism, and his skeptical moments; the constructive part would contain its psychological associationism, its empirical science of human nature, and its naturalistic or realistic moments. My intention is to question any interpretation that involves that two-part dichotomy and instead suggest that Hume performs both tasks at the same time, in successive stages. I show the unity of his philosophy in three topics: an examination of the articulation between the principle of copying and the principles of association; a demonstration of how Hume performs different tasks in two distinct stages, one negative and one positive; and a critique of the supposed skeptical and naturalistic moments.