It is so blissful in Heaven that there is nothing to remind us of spiritual practice. It is so agonizing in hell that it is impossible to practice spiritually there. In the secular world, we have suffering, joy, misunderstanding, ignorance, wisdom, enlightenment, the unenlightened, and lots of different situations. Therefore, we can learn quickly from various situations in life, and we can find sufficient material from which to experience and train ourselves. We have the chance to practice to become Buddhas, which we cannot find in other worlds. Therefore, the human body is very precious. We must cherish the chance to practice spiritually without delay.