Power, published in 1860 as part of The Conduct of Life, examines the qualities and conditions that allow individuals to act effectively in the world. Emerson considers physical energy, health, courage, practical ability and access to resources as forms of power that can shape achievement and influence.

He also explores the relationship between personal capacity and circumstance. Success, in his account, does not depend on will alone: favourable conditions, opportunity and the ability to adapt to reality also matter. Emerson is interested in people who can convert ideas and intentions into effective action.

The essay combines admiration for vigour and competence with a broader philosophical concern about how power should be understood. It presents power as a practical force rooted in character, ability and circumstance rather than merely in formal authority or social position.