If there are stronger greed, anger and delusion or ignorance; we can accept only what is sure, we can accept, understand and use only what is sure. We can not accept or understand or use what is not sure. In fact, nothing or no one or no time and no place are sure. Impermanent nature and permanent nature are sure. Cause and effect of impermanent nature are sure. With this right understanding, we should try to use all living beings and non-living beings to do good deeds, to keep precepts and to practice mindfulness and detachment. Without enough practice or action, most of the young people will misunderstand that they can do everything, they can solve all problems. Only when they are paying more attetion on practice, they can understand. Most of their thinkings are not true. If we emphasize on thinking, we will be skillful on thinking but we can not be skillful on practice or action