The way of purification.
In truth, the first quality required to take part in the service of love and devotion offered to God is to be willing to cooperate willingly with those already engaged in devotional service, and of course to offer everything to the Lord. This is how the postulant will gradually learn the various principles that govern devotional service and, depending on how he progresses in this discipline, will release himself proportionally from the stain due to contact with matter. Having strengthened his faith by this way of purification, he will then rise to develop a spiritual taste, followed by a genuine attraction for devotional service. His conviction will thus carry him to the stage of ecstasy, which precedes that of spiritual and absolute love.
Krishna, God, the Supreme Person says:
I appear from age to age, in order to deliver my devotees, destroy the unbelievers and restore the principles of spirituality. Before the creation of the cosmos, Me alone exists to the exclusion of all gross, subtle or causal phenomena. After creation, I alone live in all things, and when the time of annihilation comes, I alone dwells forever. By my insightful grace be revealed to you all the truth about My Person, My manifestations, My attributes and My entertainment. Please listen attentively to what I will tell you, for transcendental knowledge related to My Person is a science, but also has many mysteries. To those who always serve Me with love and devotion, I give intelligence through which they can come to Me. Leave there any other form of religion and simply surrender to Me, I will free you from all the consequences of your faults. Have no fear. The man of the first order is the one who finds refuge in Me in the most total abandonment and who, renouncing any form of material occupation, lives according to My teaching.
If I teach you today this very ancient science, the art of communing with the Absolute, it is because you are My friend and My devotee, and so you can unravel its sublime mystery. All beings are fragments of My Person. They are one with Me qualitatively, but differ in quantity. I want you to know this: never, in any place, under any circumstances, can we be separated, for I am everywhere present. Nothing is separated from My Person. The whole cosmic manifestation rests in Me, it is not separated from My Person. Before creation, I already existed. The whole universe, by a simple spark of My Person, I penetrate it and support it. Only by devotional service, and only in this way, can one know Me as I am. And the being who by such devotion becomes fully aware of My Person can then enter My absolute kingdom.
My dear children, of all beings who have clothed in this world material bodies, those to whom a human form has been granted should not toil day and night for the sole pleasure of the senses, accessible even to dogs and pigs who feed on excrement. Instead, they should practice penance and austerity to reach the divine level of devotional service. Through this practice, the heart is purified and we discover an eternal existence of bliss, which transcends material happiness and lasts forever. He who knows the absolute of my Advent and my actions will no longer have to be reborn in the material universe; leaving his body, he will enter my eternal kingdom.