Using both of them is superfluous. Quotation marks clearly show that part in question is taken from elsewhere - there is no need to emphasize the text with italics.

I would opt for quotation marks in this case - simply because you repeat word by word what was said in section 4.1. Italics would be likely to mean: this is very important.

Periods and commas always precede closing quotation marks (The Chicago Manual of Style, 6.8).

If possible, the opening quotation marks should precede "the" - i.e., if the sentence in Section 4.1 contains "the".

If you stick to the original format, then:
CMS, 6.3: Punctuation and font: primary system -- All punctuation marks should appear in the same font---roman or italic---as the main or surrounding text, except for punctuation that belongs to a title or an exclamation in a different font...
6.6 ... parentheses and brackets should appear in the same font---roman or italic---as the surrounding text, not in that of the material they enclose.

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6.3 has several examples, among them:

We heard his cries of "Help!"

No period; the exclamation mark and the quotation marks are italicized. So, this is what you should do if you keep the original format.