When I was a boy, I commuted a class of an abacus. I was bad at abacus. On hat day, he tild me that as it was very hot , mane pepole were absent, but I attended the class and had the excersise of abacus.The teacher said that progressin sich a hard season was valuable. he was sure I must make progress later. The teacher encoureged me. I was happy to hear that but in fact I could not make progress so much.