When we say of Krsna, Krsna is not alone. Krsna has unlimited expansions. Just like one expansion is Paramatma. Isvarah sarva-bhutanam hrd-dese ‘rjuna tisthati [Bg. 18.61]. Krsna expands Himself. There are millions and trillions of living entities. Anantyaya kalpate. The living entities... Sa ca anantyaya kalpate. So Krsna's expansion is also ananta. Not only within the heart of all living entities, but He is within the atom also. Andantara-stha-paramanu-cayantara. But this is only one plenary portion, expansion of Krsna.
Lecture on Bhagavad-gita 7.4, Vrindavana, August 10, 1974