According to Balkrishna Vishwanath Dev in the preface, what is the most effective way to perform Guru service through writing, and why is a specific format recommended?

In the preface to the Shri Sai Satcharita, Balkrishna Vishwanath Dev posits that the most certain and effective form of written Guru service for attaining salvation is writing the biography of one's own Sadguru. As explained in Chapter 0, this service should be undertaken with a firm resolve, pure heart, and selfless love. The text further specifies that a detailed poetic biography is the most suitable format. The reason provided is practical and tied to ancient tradition: poetry is easier to memorize, stays in the memory, and is easily recalled, making it ideal for regular study, recitations (Parayans), and weekly readings (Saptahs), unlike prose.