Train up a child in the way he should go: and when he is old, he will not depart from it.
Recently I've been trying to sort through the books I used for homeschooling my son to see if any were worth reselling. Not surprisingly, it was an emotional experience as I went through them, thinking back over what I might have done a little differently or taking joy in remembering precious efforts. The thing I treasure most, though, was the time my son and I were able to spend together. Having a part in shaping a child's character is an awesome responsibility and privilege.
If I had an audience with young parents, I would ask them to stop to think of what qualities and values they want to see in their children when the children have grown to adulthood. Each day, by our priorities and our actions, we are communicating what values are important.