“Self-reverence, self-knowledge, self-control,These three alone lead life to sovereign power” is taken from the poem written by-

“Self-reverence, self-knowledge, self-control,
These three alone lead life to sovereign power”- these lines occur in Alfred Tennyson’s poem ‘Oenone’. In this poem, the poet deals with the mythical story of Paris’s judgement of the beauty of three goddesses namely Hera, Athene and Aphrodite.