Can you explain the transformative power of associating with a saint, based on the story of the distressed devotee?

Chapter 18 provides a clear example of the transformative power of a saint's association, known as satsang. A devotee, feeling weary and unstable, was advised by his friends that 'even a moment's association with a saint makes the restless mind steady.' They urged him to visit Sainath in Shirdi, a holy place where many found relief. Heeding their advice, the devotee went to Shirdi. The moment he took Darshan and prostrated at Sai's feet, his eyes were cooled, and he found peace. He recognized Sai's form as the Eternal Brahman, and his mind became very pleased, demonstrating the immediate and profound benefit of a saint's presence.