The first duty towards children is to make them happy. If you have not made them so, you have wronged them. No other good they may get can make up for that.
Bio: Billie Jean King is an American former World No. 1 professional tennis player. King won 39 Grand Slam titles, including 12 singles, 16 women's doubles, and 11 mixed doubles titles. King won the singles title at the inaugural WTA Tour Championships.