There are four types of students: (1) [One who is] quick to grasp and quick to lose, his reward is offset by his loss. (2) [One who is] slow to grasp and slow to lose, his loss is offset by his reward. (3) [One who is] quick to grasp and slow to lose [is] a wise person. (4) [One who is] slow to grasp and quick to lose, this is a bad lot.