Krsna, param brahma, the Supreme Personality of Godhead, is adyam, the beginning of everything; He is adi-purusam, the ever-youthful original person. He can expand Himself in more forms than one can imagine, yet He does not fall down from His original form as Krsna; therefore He is called Acyuta. This is the Supreme Personality of Godhead. Sarvam visnumayam jagat. Sarvam khalv idam brahma. Krsna thus proved that He is everything, that He can become everything, but that still He is personally different from everything (mat-sthani sarva-bhutani na caham tesv avasthitah). This is Krsna, who is understood by acintya-bhedabheda-tattva philosophy. purnasya purnam adaya purnam evavasisyate: Krsna is always complete, and although He can create millions of universes, all of them full in all opulences, He remains as opulent as ever, without any change (advaitam). This is explained by different Vaisnava acaryas through philosophies such as visuddhadvaita, visistadvaita and dvaitadvaita. Therefore one must learn about Krsna from the acaryas. Acaryavan puruso veda: one who follows the path of the acaryas knows things as they are. Such a person can know Krsna as He is, at least to some extent, and as soon as one understands Krsna (janma karma ca me divyam evam yo vetti tattvatah [Bg. 4.9]), one is liberated from material bondage (tyaktva deham punar janma naiti mam eti so rjuna).