http://www.patheos.com/blogs/takeandread/2013/11/why-im-thankful-for-my-doubts/:
I do not doubt my son and daughter in any negative sense, but at the same time I’m not certain what they’ll face in life and what choices they will make. It is precisely this state of not knowing, of being in the dark about what may come, that lights a fire in my parental heart to raise and rear my children as best as I can. I believe in them, I believe that they can and will make good choices, but I don’t know that they will. I doubt they’ll always behave wisely. Because I cannot know with certainty that my children will always do what they ought to do, I have to have faith in them. If I assumed that they would never make a bad decision, then I would have no cause for belief or for trust.