Based on the teachings in Chapter 48, what is the key to crossing the 'ocean of worldly existence' and controlling the senses?

Chapter 48 presents a clear path for navigating life's challenges. The text explicitly states that faith (Bhava) alone is the cause for crossing the ocean of worldly existence. This faith is the seed for love, and where love exists, devotion and peace naturally follow. To supplement this, the chapter advises that by serving Sai's feet with a devotional spirit and remembering him, a devotee can gain control over their senses, preventing them from behaving as they please. This combination of unwavering faith and active devotional service makes the journey across the ocean of existence both easy and certain.