Motherhood

Growing up my mom had a quote on the fridge that said something like this, "Motherhood does not give you the right to speak without thinking, but the right to think without speaking".  And I remember thinking how often my mom must bite her tongue and how grateful I was that she just let us make our own decisions.
But now that I am a mother, I find it hard to bite my tongue when most the time I realize I should. I'm realizing that it's a fine line between correcting your children and letting them learn on their own. And where exactly do I draw the line between being an involved and attentive parent and letting them becoming independent? And as much as I want my children to think I know everything, the reality is, I know nothing! Nothing but my own life experience....