In material consciousness we are trying to love that which is not at all lovable. We give our love to dogs and cats, running the risk that at the time of death we may think of them and consequently take birth in a family of cats or dogs. Thus love that does not have Krsna as its object leads downward. It is not that Krsna or God is something obscure or something that only a few chosen people can attain. Caitanya Mahaprabhu informs us that in every country and in every scripture there is some hint of love of Godhead. Unfortunately no one knows what love of Godhead actually is. The Vedic scriptures, however, are different in that they can direct the individual in the proper way to love God. Other scriptures do not give information on how one can love God, nor do they actually define or describe what or who the Godhead actually is. Although they officially promote love of Godhead, they have no idea how to execute it. But Caitanya Mahaprabhu gives a practical demonstration of how to love God in a conjugal relationship. Taking the part of Radharani, Caitanya tries to love Krsna as Radharani loved Him. Krsna was always amazed by Radharani's love. "How does Radharani give Me such pleasure?" He would ask. In order to study Radharani, Krsna lived in Her role and tried to understand Himself. This is the secret of Lord Caitanya's incarnation. Caitanya is Krsna, but He has taken the mode or role of Radharani to show us how to love Krsna. Thus He is addressed: "I offer my respectful obeisances unto the Supreme Lord who is absorbed in Radharani's thoughts."
From TLC intro