Pleasure is _not_ a motion; for the attribute of velocity, greater or less, which is essential to all motion, does not attach to pleasure.

A man may be quick in becoming pleased, or in becoming angry; but in the act of being pleased or angry, he can neither be quick nor slow.

Nor is it true that pleasure is a generation.

In all generation, there is something assignable out of which generation takes place (not any one thing out of any other), and into which it reverts by destruction.

If pleasure be a generation, pain must be the destruction of what is generated; but this is not correct, for pain does not re-establish the state antecedent to the pleasure.