One can fully realize the Absolute Truth, the Supreme Lord, only through the practice of loving and devotional service, which is also the highest knowledge that allows one to attain the kingdom of God. To see the Lord, it is imperative to acquire perfect sight or vision of the Absolute, which lies beyond the radiance that veils Lord Krishna and envelops His personal, original, and absolute form, and this perfect vision is that of the Supreme Lord.
In truth, the Supreme Lord, Krishna, is veiled by the golden radiance emanating from His Divine body, which forms His aspect as the Impersonal Supreme Being. Only when this veil is lifted, by the grace of Lord Krishna, does He, the Absolute, appear in His true face.
Lord Krishna, the Supreme Personality of Godhead, possesses an eternal realm where He enjoys eternal recreation with His eternal companions and everything that eternally surrounds Him. This eternal realm is a manifestation of His internal energy, while the material cosmos, in which a considerable number of galaxies float, is a manifestation of His external energy or material energy. Now, when He descends into the material cosmos and more precisely into a material galaxy, He does so through His internal power, and with all His surroundings. His form, His name, His fame, His surroundings, His kingdom, are not creations of dense matter.
When He descends thus, it is to call back to Himself the fallen souls that we all are, and to reestablish the principles of religion, of spirituality, that He Himself has enunciated. No one but God can reestablish these principles. Only He, or a qualified being endowed by Him with powers for this purpose, can dictate the codes of religion.
True religion consists in knowing God, in knowing our relationship with Him, our duties towards Him, and ultimately, our destiny after leaving the material body in which we reside. People who wish to regain their sight and see life in its true light must turn to Krishna, the Supreme Personality of Godhead, and attach themselves only to His word and teaching, which represent true pure light, true celestial sustenance; thus, they will see the purpose of existence realized for them.
Lord Krishna sometimes appears personally, or He is represented by a qualified being whom He Himself endows with special powers, but in either case, the goal is the same: to bring suffering beings back to Him, to their original abode. The happiness that conditioned souls yearn for is not found anywhere among the countless material planets and galaxies.
This eternal happiness for which they thirst can be obtained only in the kingdom of God. But forgetful beings, held in thrall by the attributes of material nature, know nothing of this kingdom. Therefore, the Lord comes to spread knowledge of the spiritual world, which He accomplishes sometimes in person, in the form of an Avatar, and other times through His qualified representative, also called the son of God.