Can you explain the importance of the Guru's grace in helping a devotee overcome worldly difficulties and desires?

The Guru's grace is paramount for navigating the challenges of life. Chapter 18 describes the worldly path as narrow and difficult due to distraction and ignorance, but the Guru's word acts as a guiding "ray of light." By the power of the Guru's grace, worldly desires are said to vanish, and the disciple attains wisdom and renunciation, which are described as twin fruits. When a person is in great distress, the Lord may arrange a meeting with a saint, or Guru. This association with the Truth and service to the Guru, who is likened to a wish-fulfilling tree, is said to remove all exhaustion and steady the restless mind.