“ Because wonder is the act of one who is ignorant of the nature of something, as Damascene says. But knowledge, rather than ignorance, is a cause of pleasure. Therefore wonder is not a cause of pleasure. ”
 Thomas Aquinas, Summa Theologica (1274). copy citation

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“3: Bodily goods are conditioned by a certain fixed measure: wherefore surfeit of such things destroys the proper good, and consequently gives rise to disgust and sorrow, through being contrary to the proper good of man. ________________________
EIGHTH ARTICLE [I-II, Q. 32, Art. 8]
Whether Wonder Is a Cause of Pleasure?
Objection 1: It would seem that wonder is not a cause of pleasure. Because wonder is the act of one who is ignorant of the nature of something, as Damascene says. But knowledge, rather than ignorance, is a cause of pleasure. Therefore wonder is not a cause of pleasure. Obj. 2: Further, wonder is the beginning of wisdom, being as it were, the road to the search of truth, as stated in the beginning of Metaph. i, 2. But "it is more pleasant to think of what we know, than to seek what we know not," as the Philosopher says (Ethic. x, 7) : since in the latter case we encounter difficulties and hindrances, in the former not; while pleasure arises from an operation which is unhindered, as stated in Ethic. vii, 12, 13.” source