According to Sai's teachings, why is devotion on Earth considered more valuable than seeking a place in heaven?

Chapter 37 explains that the pursuit of heaven is ultimately futile because it is merely a place for sensual enjoyment, from which a soul inevitably falls after its merit is exhausted. The text provocatively states that the pleasure Indra experiences in heaven is fundamentally the same as a donkey's pleasure in a dung-heap. In contrast, the earth-world, though life here is fleeting, holds profound importance. As mentioned in the text, even a momentary action offered to God on Earth can lead to a state of complete fearlessness. Therefore, a spiritual community should prioritize devotion, worship, and sharing stories of the Guru here on Earth rather than striving for temporary heavenly rewards.