Don't agree with this anymore. Quoting is wonderful. Free Software is like quotations. You don't need to understand and know everything about a library to use it. You will be better if you do but it's not absolutely necessary.

I think we have to quote, we have to copy, share, redistribute, what we can and what we should.

I will quote only one place for more details: https://en.wikiquote.org/wiki/Quotations