A recent video by author and family psychologist John Rosemond has an eye-catching title: "Is Your Child Getting Enough Vitamin N?" In it, he talks about how indulging our children has become a norm, and many children today don't hear the word "no" enough. Instead of focusing on the basics of what our children need--protection, affection, and direction--we give in too often to their whims, demands, and wants.
John Rosemond's video on Vitamin N
Another author who writes about parenting, James Stenson, has included this in his list on raising children: "Realize that 'no' is also a loving word, and your children must hear it from time to time in order to acquire self-control. Children who never experience loving parental denial cannot form the concept of self-denial--and this can later lead to disaster." His entire list of things parents can do to help build character can be seen here.