is "A fool never knows that he is stupid" a paradox?

and
is "men more monstrous" and alliteration and oxymoron?

the first one is a paradox and the second is alliteration.

Wynter is right.

To determine whether a statement is a paradox, we need to examine if it is self-contradictory or logically impossible.

The statement "A fool never knows that he is stupid" is not a paradox. It conveys the idea that foolish individuals are often unaware of their own stupidity, which is generally true. Though it may seem paradoxical at first glance, it is more of an ironic or contradictory statement than a true paradox.

Now, let's analyze the second part of your question about the phrase "men more monstrous" to see if it fits the criteria for alliteration and oxymoron:

Alliteration is a literary device where consecutive words begin with the same sound or letter. In the phrase "men more monstrous," the "m" sound is repeated, qualifying it as an example of alliteration.

On the other hand, an oxymoron is a figure of speech that combines contradictory terms. In this case, the phrase "men more monstrous" does not contain contradictory terms but rather emphasizes the exaggeration of monstrous qualities in men.

Therefore, "men more monstrous" is an example of alliteration but not an oxymoron.