“I take it to be true that pure thought can grasp the real, as the ancients had dreamed.”

— Albert Einstein

from On the Method of Theoretical Physics, p. 183. The Herbert Spencer Lecture, delivered at Oxford (10 June 1933). Quoted in Einstein's Philosophy of Science http://plato.stanford.edu/entries/einstein-philscience/
1930s
Context: Our experience hitherto justifies us in trusting that nature is the realization of the simplest that is mathematically conceivable. I am convinced that purely mathematical construction enables us to find those concepts and those lawlike connections between them that provide the key to the understanding of natural phenomena. Useful mathematical concepts may well be suggested by experience, but in no way can they be derived from it. Experience naturally remains the sole criterion of the usefulness of a mathematical construction for physics. But the actual creative principle lies in mathematics. Thus, in a certain sense, I take it to be true that pure thought can grasp the real, as the ancients had dreamed.

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Albert Einstein 702

German-born physicist and founder of the theory of relativi… 1879–1955

Kazeronnie Mak

“Death only grasps; to live is to pursue, —
Dream on! there 's nothing but illusion true!”

Oliver Wendell Holmes (1809–1894) Poet, essayist, physician

"The Old Player" (1861), in Songs in Many Keys (1862).
Context: Dream on! Though Heaven may woo our open eyes,
Through their closed lids we look on fairer skies;
Truth is for other worlds, and hope for this;
The cheating future lends the present's bliss;
Life is a running shade, with fettered hands,
That chases phantoms over shifting sands;
Death a still spectre on a marble seat,
With ever clutching palms and shackled feet;
The airy shapes that mock life's slender chain,
The flying joys he strives to clasp in vain,
Death only grasps; to live is to pursue, —
Dream on! there 's nothing but illusion true!