Highlight 2: We desire pleasure and move away from pain, but we must consider the future results and future advantages -- and so there are times we will choose to endure pain for the sake of future pleasure, or choose to postpone current pleasures so that the future pleasures will be greater.
From section 32:
Surely no one recoils from or dislikes or avoids pleasure in itself because it is pleasure, but because great pains come upon those who do not know how to follow pleasure rationally. Nor again is there any one who loves or pursues or wishes to win pain on its own account, merely because it is pain, but rather because circumstances sometimes occur which compel him to seek some great pleasure at the cost of exertion and pain. To come down to petty details, who among us ever undertakes any toilsome bodily exercise, except in the hope of
gaining some advantage from it? Who again would have any right to reproach either a man who desires to be surrounded by pleasure unaccompanied by any annoyance, or another man who shrinks from any pain which is not productive of pleasure?
From section 33:
For at our seasons of ease, when we have untrammeled freedom of choice, and when nothing debars us from the power of following the course that pleases us best, then pleasure is wholly a matter for our selection and pain for our rejection. On certain occasions however either through the inevitable call of duty or through stress of circumstances, it will often come to pass that we must put pleasures from us and must make no protest against annoyance. So in such cases the principle of selection adopted by the wise man is that he should either by refusing certain pleasures attain to other and greater pleasures or by enduring pains should ward off pains still more severe.
Excerpt from section 36: "...pleasures are neglected for the purpose of obtaining pleasures still greater, or pains are incurred for the sake of escaping still greater pains."