“The [human] creation itself also will be set free from enslavement to corruption and have the glorious freedom of the children of God. ” —Romans 8:21. [period within close of quotation marks]
Jehovah is also gathering “the things on the earth,” that is, millions of people earth wide, in order that they can eventually become his earthly children. [comma within close of quotation marks]
[BTW: in UK, it's the opposite!]
Mark a word or phrase after the expression so-called, as in She is the so-called leader of the group (not She is the so-called “leader” of the group). - http://www.wilbers.com/quotes.htm [as noted, the term so-called precludes the need for quotation marks enclosing what marked word or phrase follows]
JUST SAY IT ONCE
Quotation marks can be used to indicate 'alleged' or 'so-called'. There is no need to use these actual words when using quotation marks for this purpose.
Peter's so-called "mates" left him on the path to freeze.
(In this example, "so-called" and the quotation marks are doing the same job. This is known as tautology.)
Peter's so-called mates left him on the path to freeze.
Peter's "mates" left him on the path to freeze. - http://www.grammar-