After all, mommy doesn't share her toys with her friends, does she? (momstown.ca)
If you find your child does not share toys and becomes selfish, make your child realize that being selfish can make him / her alone and keeps away from friends and joy. (theparentszone.com)
This pay - it - forward attitude is essential to effective networking (and something we learned early on as a child when sharing toys, ice cream, etc.). (careertrend.net)