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.