correct mistakes

"My son´s schoolbag lay abandoned on the rug. The light in the Professor´s study was dim. Outside the window, the blossoms on the apricot tree were heavy with rain.
The Professor never really seemed to care whether we figured out the right answer to a problem. He prefered our wild, desperate guesses to silence, and he was even more delighted when those guesses led to new problems that took us beyond the original one. He had a special feeling for what he called "correct miscalculation" for he believed that mistakes were often as revealing as the right answers. This gave us confidence even when our last efforts came to nothing".

The housekeeper and the Professor - Yoko Ogawa