“Let none think that there is no more knowledge for them to gain. The depth of human intellect may be measured; the works of human authors may be mastered; but the highest, deepest, broadest flight of the imagination cannot find out God. There is infinity beyond all that we can comprehend. We have seen only the glimmering of divine glory and of the infinitude of knowledge and wisdom; we have, as it were, been working on the surface of the mine, when rich golden ore is beneath the surface, to reward the one who will dig for it.”
Source: Christ's Object Lessons (1900), Ch. 8, p. 114
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Ellen G. White 48
American author and founder/leader of the Seventh-Day Adven… 1827–1915Related quotes

"The Free Universal Encyclopedia and Learning Resource" (1999) http://www.gnu.org/encyclopedia/free-encyclopedia.html
1990s

Introduction "On The Sources of Knowledge and of Ignorance" Section XVII, p. 30 Variant translation: I believe it is worthwhile trying to discover more about the world, even if this only teaches us how little we know. It might do us good to remember from time to time that, while differing widely in the various little bits we know, in our infinite ignorance we are all equal.
If we thus admit that there is no authority beyond the reach of criticism to be found within the whole province of our knowledge, however far we may have penetrated into the unknown, then we can retain, without risk of dogmatism, the idea that truth itself is beyond all human authority. Indeed, we are not only able to retain this idea, we must retain it. For without it there can be no objective standards of scientific inquiry, no criticism of our conjectured solutions, no groping for the unknown, and no quest for knowledge.
Conjectures and Refutations: The Growth of Scientific Knowledge (1963)

Coding theorems for a discrete source with a fidelity criterion. IRE International Convention Records, volume 7, pp. 142--163, 1959.
Context: This duality can be pursued further and is related to a duality between past and future and the notions of control and knowledge. Thus we may have knowledge of the past but cannot control it; we may control the future but have no knowledge of it.

Introduction<!-- pp. 3-4 -->
The Idea of Progress: An Inquiry Into Its Origin and Growth (1921)
Context: Science has been advancing without interruption during the last three of four hundred years; every new discovery has led to new problems and new methods of solution, and opened up new fields for exploration. Hitherto men of science have not been compelled to halt, they have always found ways to advance further. But what assurance have we that they will not come up against impassable barriers?... Take biology or astronomy. How can we be sure that some day progress may not come to a dead pause, not because knowledge is exhausted, but because our resources for investigation are exhausted... It is an assumption, which cannot be verified, that we shall not reach a point in our knowledge of nature beyond which the human intellect is unqualified to pass.

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 429.

1790s, Discourse to the Theophilanthropists (1798)