“As in respect of the first wonder we are all on the same level, how comes it that the philosophic mind should, in all ages, be the privilege of a few? The most obvious reason is this: The wonder takes place before the period of reflection, and (with the great mass of mankind) long before the individual is capable of directing his attention freely and consciously to the feeling, or even to its exciting causes. Surprise (the form and dress which the wonder of ignorance usually puts on) is worn away, if not precluded, by custom and familiarity.”
Aids to Reflection (1873), Sequelae to Aphorism 107
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Samuel Taylor Coleridge 220
English poet, literary critic and philosopher 1772–1834Related quotes

Aids to Reflection (1873), Aphorism 107

Tibawi, A.L. (ed. and tr.). (1965) Al-Risala al-Qudsiyya (The Jerusalem Epistle) “Al-Ghazali's Tract on Dogmatic Theology”. In: The Islamic Quarterly, 9:3–4 (1965), 3-4.
if he does depart from his state of wonder, he has ceased to philosophize.
Source: Leisure, the Basis of Culture (1948), The Philosophical Act, pp. 105–106

“Wonder is the feeling of a philosopher, and philosophy begins in wonder.”
Theaetetus, 155d
Plato, Theaetetus

“Wonder is the feeling of a philosopher, and philosophy begins in wonder.”
155, The Dialogues of Plato, Volume 3, 1871, p. 377 http://books.google.com/books?id=4kQNAAAAIAAJ&pg=PA377
Theaetetus

The Home Club: For Servants Only, in the Brooklyn Daily Eagle (12 October 1913)

Metaphysics by Aristotle – Book 1, ClassicalWisdom.com
The second sentence is in Metaphysics A 2, 928<sup>b</sup> 17–20, Aristotle: Metaphysics Beta: Symposium Aristotelicum, Michel Crubellier & Andre´ Laks, eds. (Oxford University Press, 2009), p. 4.
Metaphysics
Variant: [And] one who experiences a difficulty and who feels wonder thinks that he does not understand..., so that, if it is to escape ignorance that they have practised philosophy, then it is clearly for the sake of knowing, and not for any practical purpose, that they have pursued understanding.

The New Hugo Winners: Award-winning Science Fiction Stories Vol. 1 (1989)<!-- Afterword to "Speech Sounds" -->, p. 215
General sources
Context: We are meant to know, or we are amoebae.
Suppose that we are wise enough to learn and know — and yet not wise enough to control our learning and knowledge, so that we use it to destroy ourselves?
Even if that is so, knowledge remains better than ignorance. It is better to know — even if the knowledge endured only for the moment that comes before destruction — than to gain eternal life at the price of a dull and swinish lack of comprehension of a universe that swirls unseen before us in all its wonder. That was the choice of Achilles, and it is mine, too.
Source: Wicked: The Life and Times of the Wicked Witch of the West