What's wrong with this? Copying without understanding and without context is wrong and downright dumb. But copying after realizing the context and modifying the text to suit your paper is not wrong. Do you cite Newton and Einstein every time you solve a mechanics problem? Or quote Descartes after answering(if there is a definite one) a philosophical riddle?
I haven't ever written a single submission without 'referring' to the internet and surfing through those e-books, g-books, jstor, sciencedirect etc. and I can safely say it has contributed to my intelligence and knowledge. Of course I mention the text every now and then, but if a text has no solid copyable material which I can use to build upon in my answer then it does not deserve to be quoted.