Intellect, first published in 1841, examines the nature of thought and the conditions under which genuine insight becomes possible. Emerson distinguishes the intellect from deliberate calculation, presenting it as a receptive faculty capable of recognising truths that arise through perception, intuition and reflection.

He argues that intellectual life is weakened when people cling too closely to fixed theories, authorities or personal interests. The thinker should remain open to new impressions and allow ideas to develop without forcing them into established systems. Emerson also stresses that insight cannot be entirely commanded; important thoughts may appear unexpectedly and must be received with attention.

The essay reflects his broader Transcendentalist emphasis on independence of mind and direct experience. It presents knowledge as an active, evolving process in which intellectual freedom depends on curiosity, receptiveness and a willingness to revise earlier conclusions.