The text states that a life without patience is 'in vain.' Can you elaborate on the transformative power of patience versus the consequences of its absence, using the provided analogies?

Chapter 19 teaches that a lack of patience renders a life 'in vain' and leaves a person in a 'pitiable state.' To illustrate the transformative power of cultivating patience, the text uses a powerful analogy. It compares a person with patience to a gem and one without to a stone. Both are rubbed on a whetstone, representing life's trials. While the stone may become smooth, it remains a stone. The gem, however, is polished by the same process and "becomes a brilliant jewel." This shows that adversity reveals and perfects the inherent quality of patience, leading to spiritual brilliance, whereas its absence means one cannot transcend their base nature despite undergoing the same experiences.