Lao Tzu said, "extremes meet." Happiness always leads to sadness. So there is no absolute happiness.

Also, for a simple example, do you think cheating is good or bad?

It's certainly wrong to lie casually. But in the face of a seriously ill patient, in order to reassure him, shouldn't we lie to him and say that he will be well soon? If he is caught by the enemy to torture military secrets, should he lie to him "I don't know"? Therefore, cheating is not good or bad, it depends on the specific situation.

This is called "nothing is absolute".