I know every mother has bad days. I feel like I have one or two (or three) a week--at least. You know, the days when at the end of it all I can really say is I didn't kill anyone today. The days when, try as you might, you just can't hold your temper with your child and you yell, yell, yell, even though you know that isn't going to be any more effective at getting your child to comply in the short run and in the long run it'll damage your child's perception of appropriate behaviour.
The days you feel like a failure.
But then, there's also that moment at the end of the day when, despite your frustration and your ire, your child looks at you and tells you, "I love you too" and you remember why you love this child.