Thank you, Calif.
Can you tell me what you mean by the same rules can be applied to parenthetical content?
As to the application of the rules to quoted content, I think mostly we focus on some content that is taken from a writing content but can it be done for the case where you are not quoting from any source but using it to bring out a content like this?
A possible title to a post:
What does "It's awesome" mean? -- Here, a person did not pull the content in quotation marks out from anywhere or referring to anything special, but rather decided to put the quotation marks around the clause for the purpose of bring it out for an inquiry, thus making it to act as a noun that shows general meaning.
Jesus wants to be the "someone else" in our lives whom we put first. -- Usually, we use the phrase "someone else" without any articles but in this case we can use "the' because we are specifying a specific someone else, but can we write without the quotation marks like this?
Jesus wants to be the someone else in our lives whom we put first.
Is quotation marks necessary because it is a not-so-usual use of the word "someone else"?