1) do you think it's a good idea to provide this quote on my personal
statement?
First of all: Good for you for pursuing an education!
That being said: No, I do not think it's a good idea to quote the WT on your personal statement.
FYI: I'm a high school teacher in the United States and have written MANY letters of recommendation for my students. Several have gotten into very prestigious universities.
Do NOT go into your JW past. Don't do it.
If you really want to tell your story, do so with out mentioning the specifics. You could say something to the affect that you were raised in a community/culture that does not value higher education; yet in spite of that ... [your details here].
2) If so, can anybody provide the exact quote and the exact
year, page etc so that I can cite it appropriately?
Yes, but I won't. See above.