Besides the story of the plank, what other key teachings about the Sadguru are presented in Chapter 10?

Beyond the fascinating account of the sleeping plank, Chapter 10 delivers profound teachings about the role of the Sadguru. It emphasizes that remembering the Guru with love is the best and easiest spiritual practice (Sadhana) for untying the knot of birth and death. The chapter asserts that all other gods are illusory and the "Guru alone is the one eternal God." For devoted bhaktas, the Sadguru acts as a boatman to cross the ocean of existence (Bhavasagar), placing Knowledge in their hands and granting the blissful attainment of liberation, or Moksha, effortlessly.