Can you explain the consequences of wasting a human life, as described in these passages?

Chapter 8 emphasizes that the human body is a rare prize obtained through "great good fortune and gathering millions of merits." Wasting this opportunity is deemed foolish. The text warns against procrastinating spiritual practice with the thought, "I will do it in the next birth," because there is "no certainty that this same form will return." The consequences are directly tied to karma. As Chapter 8 explains, many sinners re-enter the cycle of birth and death by taking a new body. Some may even regress further, moving from the animal kingdom back to the "stationary (plants/stones) state according to their deeds." Therefore, wasting a human life risks a severe spiritual decline.