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: Antoine Marie Jean-Baptiste Roger, Vicomte de Saint-Exupéry was a French writer, poet, aristocrat, journalist, and pioneering aviator. He became a laureate of several of France's highest literary awards and also won the U.S. National Book Award.