Dear Undergraduate Student,
I realize that you're not pursuing a career in philosophy, and that you're most likely taking a philosophy course simply because it fulfills some curricular requirement and my course in particular fit in well with the rest of your schedule. (The circumstances through which I came to teach the course you're in are not much different.)
But the fact that you're not planning to go into philosophy as a career is no excuse for cheating. Moreover, you should know that the fact that the internet makes cheating relatively easy means that it also makes cheating-detection even easier. The sentence containing a pithy aside about a figure/idea that we hadn't discussed in class simply was put into Google, and the source from which you plagiarized came up as the first hit. Good job.