Answer:
A god's will is supreme over a mortal's will.
Step-by-step explanation:
Neptune is the Roman god of the sea and as a deity he has complete freedom to pass over the will of mortals and do what he wants, even if this is an unjust and immoral thing, that is, no mortal has enough power to prevent power of a god.
For this reason, Jove, a mortal, allows Neptune to punish the ugly, even though he disagrees with Neptune's decision.