From my mom (mostly before I ever had kids):
"If your body is designed with it/to do it, that's the way to go" That's paraphrased from numerous comments about the value of foreskins and breastmilk.
"You can't spoil a child with too much love/You can't spoil a baby."
"If it doesn't feel right, it probably isn't."
"Kids get wet and dirty. They just do. You might as well enjoy it."
"He doesn't need that stuff. He needs you."
"You don't need to be perfect at this - nobody is."
One of her friends once told me that she knew I'd be a good mom, because I don't sweat the small stuff. She didn't mean it as advice, but I did take it that way. For a variety of reasons, I do sweat the small stuff more than I used to, and it does have a negative impact on my parenting.
"You just need to remember the important thing about kids. They're just small people."
Lots of random comments about the importance of love, hugs, fresh air, home-made food, and real interaction, as opposed to designer labels, fancy electronics and a show home.
And, an old friend (can't remember which one now...how odd) once told me that the most important thing to remember about being "mommy" is that mommy is me. My kids needed me to be myself before anything else.