Whether there is any sorrow contrary to the pleasure of contemplation?

Objections

Objection 1 : It would seem that there is a sorrow that is contrary to the pleasure of contemplation. For the Apostle says (2 Cor. 7:10): "The sorrow that is according to God, worketh penance steadfast unto salvation." Now to look at God belongs to the higher reason, whose act is to give itself to contemplation, according to Augustine (De Trin. xii, 3,4). Therefore there is a sorrow contrary to the pleasure of contemplation.
Objection 2 : Further, contrary things have contrary effects. If therefore the contemplation of one contrary gives pleasure, the other contrary will give sorrow: and so there will be a sorrow contrary to the pleasure of contemplation.
Objection 3 : Further, as the object of pleasure is good, so the object of sorrow is evil. But contemplation can be an evil: since the Philosopher says (Metaph. xii, 9) that "it is unfitting to think of certain things." Therefore sorrow can be contrary to the pleasure of contemplation.
Objection 4 : Further, any work, so far as it is unhindered, can be a cause of pleasure, as stated in Ethic. vii, 12,13; x, 4. But the work of contemplation can be hindered in many ways, either so as to destroy it altogether, or as to make it difficult. Therefore in contemplation there can be a sorrow contrary to the pleasure.
Objection 5 : Further, affliction of the flesh is a cause of sorrow. But, as it is written (Eccles. 12:12) "much study is an affliction of the flesh." Therefore contemplation admits of sorrow contrary to its pleasure.