Vasari says of the child Leonardo "He would have been very proficient in his early lessons, if he had not been so volatile and flexible; for he was always setting himself to learn a multitude of things, most of which were shortly abandoned. When he began the study of arithmetic, he made, within a few months, such remarkable progress that he could baffle his master with the questions and problems that he raised... All the time, through all his other enterprises, Leonardo never ceased drawing..."