“Curious, if we will reflect on it, this of having no books. Except by what he could see for himself, or hear of by uncertain rumor of speech in the obscure Arabian Desert, he could know nothing. The wisdom that had been before him or at a distance from him in the world, was in a manner as good as not there for him. Of the great brother souls, flame-beacons through so many lands and times, no one directly communicates with this great soul. He is alone there, deep down in the bosom of the Wilderness; has to grow up so,—alone with Nature and his own Thoughts. But, from an early age, he had been remarked as a thoughtful man.”

Quote from "The Awe-Struck Witness" in TIME magazine (28 October 1974) http://www.time.com/time/magazine/article/0,9171,908926-1,00.html and in "On the Brink: The Artist and the Seas" by Eldon N. Van Liere in Poetics of the Elements in the Human Condition: The Sea (1985) ed. Anna-Teresa Tymieniecka
Variant translations:
The artist should not only paint what he sees before him, but also what he sees within him. If, however, he sees nothing within him, then he should also omit to paint that which he sees before him.
As quoted in German Romantic Painting (1994) by William Vaughan, p. 68
undated
Context: The artist should not only paint what he sees before him, but also what he sees in himself. If, however, he sees nothing within him, then he should also refrain from painting what he sees before him. Otherwise his pictures will be like those folding screens behind which one expects to find only the sick or the dead.

1840s, Heroes and Hero-Worship (1840), The Hero as Divinity

"Anima Poetæ : From the Unpublished Note-books of Samuel Taylor Coleridge" (1895) edited by Ernest Hartley Coleridge, p. 238

Black Elk Speaks (1961)
Context: Crazy Horse dreamed and went into the world where there is nothing but the spirits of all things. That is the real world that is behind this one, and everything we see here is something like a shadow from that one. He was on his horse in that world, and the horse and himself on it and the trees and the grass and the stones and everything were made of spirit, and nothing was hard, and everything seemed to float. His horse was standing still there, and yet it danced around like a horse made only of shadow, and that is how he got his name, which does not mean that his horse was crazy or wild, but that in his vision it danced around in that queer way.
It was this vision that gave him his great power, for when he went into a fight, he had only to think of that world to be in it again, so that he could go through anything and not be hurt. Until he was killed at the Soldiers' Town on White River, he was wounded only twice, once by accident and both times by some one of his own people when he was not expecting trouble and was not thinking; never by an enemy. He was fifteen years old when he was wounded by accident; and the other time was when he was a young man and another man was jealous of him because the man's wife liked Crazy Horse.
They used to say that he carried a sacred stone with him, like one he had seen in some vision, and that when he was in danger, the stone always got heavy and protected him somehow. That, they used to say, was the reason that no horse he ever rode lasted very long. I do not know about this; maybe people only thought it; but it is a fact that he never kept one horse long. They wore out. I think it was only the power of his great vision that made him great.

Original in German: Einen solchen Standpunkt fand Goethe früh in Spinoza, und er erkennet mit Freuden, wie sehr die Ansichten dieses großen Denkers den Bedürfnissen seiner Jugend gemäß gewesen. Er fand in ihm sich selber, und so konnte er sich auch an ihm auf das schönste befestigen.
Johann Peter Eckermann, Gespräche mit Goethe in den letzten Jahren seines Lebens, 1831
A - F

As quoted in The Annual Review and History of Literature http://books.google.com.mx/books?id=hx0ZAAAAYAAJ&printsec=frontcover&hl=es#v=onepage&q=%22The%20Lord%20himself%20hath%20led%20him%20with%20his%20own%20Almighty%20hand%22&f=false (1806), by Arthur Aikin, T. N. Longman and O. Rees, p. 472.
Also found in Life of Linnaeus https://archive.org/stream/lifeoflinnaeus00brigiala#page/176/mode/2up/search/endeavoured (1858), by J. Van Voorst & Cecilia Lucy Brightwell, London. pp. 176-177.
Linnaeus Diary

Source: Titus Groan (1946), Chapter 69 “Mr Rottcodd Again” (p. 393)

Source: The Coldest Night (2012), p. 243

"The Rediscovery of Christ," Witness to the Truth: Christ and His Interpreters (1962)