First do no harm.
That is good advice for any sort of living.
Most of us would never dream of purposely hurting someone we love and yet it happens all the time.
The gifts we give can be two edged swords, severing independence and creativity and self respect when that was not our intention at all.
There is a time to step in between our children and some dangerous force in the world and that is when they are young and vulnerable and unable to defend themselves.
Once we have given them the tools they need to stand on their own two feet, though, we need to step back and let them try it out. Better to fall on your face when you are 22 than 42. Better too, to do it when you are not supporting anyone but yourself.
If you never fall, you never have to learn how to get up. Life is a series of lessons. What is good and sweet and necessary for the young child becomes a cruel lesson in keeping adult children weak and dependent on us.
I feel terrible when my children need something, especially if I can give it to them, but it is not my feelings that are important -- it is my children's feelings that matter. Nothing makes a person feel better than knowing he, or she, can take care of herself, or himself. It is powerful! It's worth a little suffering.
It is the hero's tale, the coming of age story, the necessary annealing of a human spirit I would never want to deny someone I love.
Allowing that to happen takes a heroic heart. Parenting is not for the weak of spirit!