Alvin Lal: When Vyas Muni wrote the Vedas on Bhoj Patra for the first time, how did he choose what knowledge from which of the four Vedas Agni, Vayu, Aditya, and Angira goes where? i.e. How did it come to be four books and not five (for example), Rigveda, Samved, Atharvaved, and Yajurved? How was the original knowledge division/ correlation done into four books? How was it categorised, if at all? Meaning from the original 4 Vedas, whose knowledge was transferred by mouth, how was that knowledge divided up into 4 books? Hopefully swamiji you can enlighten me once more..