tena te sravayisyami yat-tad-brahma-sanatanam
na sakyam vistarat krtsnam vaktum sarvasya kenacit
yuktenapi vibhutinam api varsa-satair-api
yasyadir-madhyam-antam ca surair-api na gamyate.
There is a commentary on the Siva-sahasranama by Nilakantha who was a follower of Sri Sankara's Advaita. He has written a commentary on the Bhagavad-Gita also, in the invocatory verse to which he pays obeisance to Sri Sankara. Later in the course of the commentary, he describes how his own work is but a lamp which may serve to dispel the limited darkness in a cave, but cannot compare with the effulgent Sun that is Sri Sankara's bhasya on the Gita.
Like the Siva-sahasranama, the Visnu-sahasranama also forms part of the Anusasanaparva of the Mahabharata, It is given as instruction to Yudhisthira by Bhisma, in the presence of Sri Krishna Himself. Preparatory to reciting the one-thousand names, Bhisma says thus:
"That whence all beings issue at the beginning of the yuga, that where into they are, verily, dissolved again when the yuga ends.