T.S. Eliot's theory of impersonality in poetry states that poets should not express their personal emotions, but instead express universal truths. Eliot believed that poetry should be an escape from personality, and that the poet should be a vessel for tradition.
Personal feelings
Eliot believed that poets should transform their personal feelings into impersonal statements.
Universal truths
Eliot believed that poetry should express universal truths, not the poet's personal beliefs.
Criticism
Eliot believed that readers should criticize poems, not the poets who wrote them.
Tradition
Eliot believed that poets should immerse themselves in the works of past poets and express the sense of literary tradition.
Language
Eliot believed that poets should use the vernacular speech of their era, and avoid artificiality.
Imagery
Eliot believed that poets should use definite and specific imagery.