This aphorism is about not exceeding your limits. If your head is made out of wax, then it will melt if you go out in the sun. Similarly, if you have a big exam, you shouldn't go party the night before, or any similar comparison that you can think of.
Yeah hes right for optinal reasons.
The poem includes neoclassical elements such as elevated language and heroic couplets. The line "Fair Freedom now her ensigns bright displays" is an example of the elevated style of the poem. The poem also expresses a political (nationalistic) point of view, and its subject is a desirable human state in the future.
I think that she lied about maybe the scar ?