Can you elaborate on the relationship between scholarly pursuit and divine grace as illustrated by Das Ganu's experience in writing the 'Ishavasya-Bhavartha-Bodhini'?

Das Ganu's experience, as narrated in Chapter 20, highlights that scholarly pursuit alone is inadequate for true spiritual understanding. Although he completed the verse-commentary, a work accepted by the learned, his mind 'found no joy' because he couldn't access the 'internal secret' of the Upanishad. The text makes it clear that this is a 'difficulty without Guru's grace.' It is only when 'Sainath showed grace' that the difficulty vanished. The text uses the metaphor of Ganudas's speech being a 'stream of milk' and Sai's grace being the 'sugar in it' to show that divine grace is the essential element that sweetens and completes the scholarly effort, making the profound meaning accessible.