Science has done much for us; but it is a poor science that would hide from us the great deep sacred infinitude of Nescience, whither we can never penetrate, on which all science swims as a mere superficial film.
 Thomas Carlyle, On Heroes, Hero-Worship, and The Heroic in History (1841). copy citation

Context

“We call that fire of the black thunder-cloud "electricity," and lecture learnedly about it, and grind the like of it out of glass and silk: but what is it? What made it? Whence comes it? Whither goes it? Science has done much for us; but it is a poor science that would hide from us the great deep sacred infinitude of Nescience, whither we can never penetrate, on which all science swims as a mere superficial film. This world, after all our science and sciences, is still a miracle; wonderful, inscrutable, magical and more, to whosoever will think of it.
That great mystery of TIME, were there no other; the illimitable, silent, never-resting thing called Time, rolling, rushing on, swift, silent, like an all-embracing ocean-tide, on which we and all the Universe swim like exhalations, like apparitions which are, and then are not: this is forever very literally a miracle; a thing to strike us dumb,—for we have no word to speak about it.” source