Can you explain the historical context of Parayans and Saptahs as presented in the preface?

The practice of performing Parayans (readings) and Saptahs (weekly recitations) is described as being very ancient, with origins dating back to the Vedic era. As mentioned in Chapter 0, this tradition is not new and is seen in the daily recitations of great Sanskrit works like the Vedas, Bhagavata, and Ramayana. The tradition also continued with world-revered Marathi works such as Shri Dnyaneshwari and Shri Dasbodh. The text uses this long-standing historical custom to validate its recommendation of performing Parayans and Saptahs of a Guru's biography, positioning it within a revered and ancient spiritual lineage.