So how are you going to recognise God if He comes on earth? Are you going to ask to see His identity card or passport? See if it says, 'Name … God; Occupation … Generator, Operator, Destroyer'? That's foolish! Or are you going to recognise Him only if He fits your mental picture of Him — what you have picked up from scriptures and other impressions, what you imagine Jesus or Krishna looked like? But even two Christians will have different impressions of what Jesus will look like. So what will be recognised by one will not be recognised by the other. But the test of the Perfect Master is that which is undeniable to everybody and that is the experience of Himself, which He can give, and that is the True Knowledge.
from "The Sayings of Guru Maharaj Ji" - Published by Shri Hans Publications, 148-150 Lordship Lane, London SE22, Copyright Divine Light Mission 1974.