No man whatever believes, or can believe, exactly what his grandfather believed
 Thomas Carlyle, On Heroes, Hero-Worship, and The Heroic in History (1841). copy citation

Context

“Every man, as I have stated somewhere, is not only a learner but a doer: he learns with the mind given him what has been; but with the same mind he discovers farther, he invents and devises somewhat of his own. Absolutely without originality there is no man. No man whatever believes, or can believe, exactly what his grandfather believed: he enlarges somewhat, by fresh discovery, his view of the Universe, and consequently his Theorem of the Universe,—which is an infinite Universe, and can never be embraced wholly or finally by any view or Theorem, in any conceivable enlargement:” source