The gift of the Magi

Eight dollars a week or a million a year --- what is the difference?
A mathematician or a wit would give you the wrong answer.
The Magi brought valuable gifts, but that was not among them.
This dark assertion will be illuminated later on.
Jim draw a package from his overcoat pocket and threw it upon the table.

a wit : 才子、才知の優れた人
The Magi : 東方の賢者たち（キリストの誕生を祝って贈り物を持ってきた三人の賢者）
that :正しい答え（前行のthe wrong answer に対して）
them : 賢者の持ってきたvaluable gifts
this dark assertion : この意味のはっきりしない主張
be illuminated : 解明される