The text mentions that some older works are not ideal for a detailed Parayan of a single saint. Can you explain why?

The preface explains this limitation in the context of works by the poet Shri Dasganu Maharaj, specifically 'Shri Bhaktalilamrut' and 'Shri Bhaktisaramrut'. While one can perform a Parayan of these entire works, Chapter 0 clarifies that they are not suitable if a devotee wishes to perform a Saptah focused on a single saint's biography. The reason provided is that the biographical sections for any given saint within these books are not comprehensive or detailed, often taking up only two or three pages. This brevity makes them insufficient for the in-depth, extended study that a Parayan requires.