Ideas of Good and Evil gathers W. B. Yeats at his most searching: poet, critic, mystic, and cultural visionary. Across essays on poetry, symbolism, theatre, Irish literature, and the imagination, he asks what gives art its authority, how tradition shapes expression, and why beauty seems bound to memory, myth, and spiritual force. Yeats traces his lifelong wish to create an Irish poetry with native music and inherited depth, defending verse that grows from collective feeling rather than modern "popular" clarity. He explores spoken poetry, musical accompaniment, and experiments in performance, imagining a disciplined new art that restores rhythm, nuance, and dignity to the spoken word. Other essays argue that art should reveal archetypal truth rather than imitate nature, and that great literature exposes the hidden self beneath social judgment. He praises Balzac's insight, rebukes utilitarian criticism of Shakespeare, and challenges moralizing readers who value success over spiritual largeness. Alongside these literary meditations stands Yeats's visionary faith in magic, symbols, and unseen powers, including a haunting séance narrative that blurs memory, reincarnation, and occult terror. The result is a passionate, original collection in which criticism becomes a quest for the deeper sources of creative life. This edition has been fully restored with modern typesetting, custom cover design.