Known sourcecanonical
"So his life has flowed From its mysterious urn a sacred stream, In whose calm depth the beautiful and pure Alone are mirrored; which, though shapes of ill May hover round its surface, glides in light, And takes no shadow from them."
Thomas Noon Talfourd / Ion. Act i. Sc. 1.
Ion. Act i. Sc. 1.
Bartlett's Familiar Quotations, 9th ed. (Little, Brown, 1905), public domain