In life we are driven to seeking pleasure. We therefore seek to avoid pain. Pain is not always bad, as is pleasure not always good.
Interpretation: For example, we may perceive as work being painful, and vacations being pleasurable. In fact, it’s a lot about framing things.
We further avoid pain, such as doing things we don’t like, however, by doing that we deny ourselves pleasure. So, there is a ying/yang effect between pleasure / pain – and one cannot exist without the other.
Just call me Nietzsche.