When we get good at something, it becomes easy. As a result, we forget how hard it once was and undervalue its difficulty. What might be easy for a teacher might be difficult for a student.
Brushing our teeth is easy because we do it everyday. But just try brushing with your weaker hand. Doing so reveals the complexity behind something as easy as brushing your teeth.
Empathetic teachers do not lose touch with what it feels like to be a student.