Based on the text, which is considered a more powerful purifier: performing holy vows or gaining knowledge?

Chapter 50 establishes a clear hierarchy of purification. While it acknowledges that 'all holy places and vows are purifying,' it makes a definitive statement that 'knowledge is more purifying than the purifiers.' This indicates that external religious observances are secondary to the internal attainment of Brahman-knowledge. The text reinforces this by stating that without this supreme knowledge, even devotional acts like 'bhajan and worship are meaningless.' Therefore, while rituals may have their place, the ultimate and most effective means of purification is the acquisition of true knowledge, which cleanses the soul at the deepest level.