According to the provided text, what is the recommended spiritual practice for a devotee, and what should be avoided?

Chapter 19 offers very specific guidance on the spiritual path, emphasizing devotion and faith over all else. The primary instruction is to "Look at me with undivided attention, and I will look at you the same way." The text explicitly de-emphasizes other means, stating there is "No need for abundance of spiritual means, no need for cleverness in the six Shastras." Instead of complex rituals or intellectual pursuits, the one essential requirement is to foster "complete faith that the Guru is the doer and the destroyer." This highlights a path of pure, unwavering trust, where the Guru is seen as the supreme power, embodying the divine.