Not exactly a quote, but I always liked:
She was buns up, kneeling.
I don't know why anyone wouldn't like him as a human being. Well of course in these days he had many traits in common with CEO's who get government bailouts. He was a perfectionist, he was an a****le, he thought himself on a plane above his peers, he was demanding of his employees, and he expected nothing but the best. There are 60+ albums to attest to that. The big difference of course that he had a sense of humor about the whole enterprise.
If I had a child who wanted to be a musician (and I have children but they are not foolish enough to be musicians, not in the era of "music wants to be free"), I would tell them be exactly like Zappa. Be as dirty as you want, be as political as you want, challenge everything.