Thakura Bhaktivinoda's bhasa on Sri Das Goawami's Manah Siksa.
In commenting on sloka 2, Bhaktivinoda explains the words zacIsUnuM nandIzvarapatisutatve " See Sachi's son as (none other than)the son of the cowherd chief."
All types of paricarya to the divine couple are undertaken by first invoking the rememberance of Sri guru and Sri Gaurangadeva; without adhearing to this it will not be possible to attain the high ideal ( paramartha) of ones desired siddhi. If Sri Sachinandan is worshiped independantly then it will not enable one to concieve the non-distinction from sri Krsna. When there is a proper conception of non-distinction, then the worship of Sri Gauranga is interwoven with the worship of Sri Krsna.