Makes sense i understand why they would do it
The sentence “Abstain from all appearance of evil” is an imperative statement. These types of sentences usually do not have a subject and their structures consist mainly on the bare verb alone. The main purpose of an imperative statement is to give commands. So, in this sentence, there is no subject and it is commanding somebody to abstain from doing something.
I believe he is drawing a parallel between a tone of pure joy and the most depressing despair.
#5 is hyperbole because hyperbole exaggeration and the sentence "enough to feed a army" is exaggeration
Yes, "All teenagers are mean and smelly they really need to clean up their acts." is a run on sentence.