"The History of the World is But the Biography of Great Men"
If this were really a final exam, you would not be allowed to use Google; and obviously part of the test would be to see if you can attribute the quote to its proper source. But since this isn't a test, here's the passage in question, from Carlyle:
Thus if the man Odin himself have vanished utterly, there is this huge Shadow of him which still projects itself over the whole History of his People. For this Odin once admitted to be God, we can understand well that the whole Scandinavian Scheme of Nature, or dim No-scheme, whatever it might before have been, would now begin to develop itself altogether differently, and grow thenceforth in a new manner. What this Odin saw into, and taught with his runes and his rhymes, the whole Teutonic People laid to heart and carried forward. His way of thought became their way of thought:--such, under new conditions, is the history of every great thinker still. In gigantic confused lineaments, like some enormous camera-obscure shadow thrown upwards from the dead deeps of the Past, and covering the whole Northern Heaven, is not that Scandinavian Mythology in some sort the Portraiture of this man Odin? The gigantic image of his natural face, legible or not legible there, expanded and confused in that manner! Ah, Thought, I say, is always Thought. No great man lives in vain. The History of the world is but the Biography of great men.
To me there is something very touching in this primeval figure of Heroism; in such artless, helpless, but hearty entire reception of a Hero by his fellow-men. Never so helpless in shape, it is the noblest of feelings, and a feeling in some shape or other perennial as man himself. If I could show in any measure, what I feel deeply for a long time now, That it is the vital element of manhood, the soul of man's history here in our world,--it would be the chief use of this discoursing at present. We do not now call our great men Gods, nor admire without limit; ah no, with limit enough! But if we have no great men, or do not admire at all,--that were a still worse case.