In her book Teach Your Children Well, Dr. Madeline Levine writes: “Part of feeling successful at something is being good at it and most of being good at something has to do with effort and persistence. ”
Raamatus „Teach Your Children Well ” kirjutab dr Madeline Levine:„ Üheks põhjuseks end milleski edukana tunda on see, kui ollakse selles asjas osav, ja et saada osavaks, läheb tarvis pingutust ja püsivust. ”