We suffer pain, but we also suffer pleasure. Fundamentally, to suffer is to be passive, to be acted upon, to be at the mercy of what is not oneself. Excessive pleasure and pain should both be avoided as one avoids heteronomy, the heteronomy of the not-self. Compare Plato, Timaeus 86c:
. . . excessive pains and pleasures are justly to be regarded as the greatest diseases to which the soul is liable. For a man who is in great joy or in great pain, in his unseasonable eagerness to attain the one and to avoid the other, is not able to see or hear anything rightly, but he is mad and is at the same time utterly incapable of any participation in reason.
It is useful to practice distancing oneself from one’s sensations in order to study them objectively. To sensations good and bad, say: “You are only a sensation, an external occurrence whose effect on me, for good or ill, is partly due to my cooperation and is therefore partly under my control.” The worldling seeks pleasure (‘excitement,’ ‘thrills’) and shuns pain. The sage accepts both as byproducts of worthwhile activities. Tha mastery of desire and aversion is not easy, and it is a good bet that one won't advance far in it; but any advance is better than none.