SrIman nArAyaNan who is enjoying unlimited bliss with nithya sUris and mukthAthmAs in SrIvaikuNtam (paramapadham), out of his causeless mercy, being worried about the state of bound souls who are suffering in this material world, descends himself in the form of many archA (deity) forms in many temples, mutts, homes, etc. It is this archAvathAram (deity form) is the most merciful form and the epitome of bhagavAn’s most auspicious qualities.
