Only love for the Supreme Lord is true Bhakti. Love for any other being, however great, is not Bhakti. The "Supreme Lord" here means Ishvara, the concept of which transcends what you in the West mean by the personal God. "He from whom this universe proceeds, in whom it rests, and to whom it returns, He is Ishvara, the Eternal, the Pure, the All-Merciful, the Almighty, the Ever-Free, the All-Knowing, the Teacher of all teachers, the Lord who of His own nature is inexpressible Love."
A strange thing has happened - while all the other arts were born naked, this, the youngest, has been born fully-clothed. It can say everything before it has anything to say. It is as if the savage tribe, instead of finding two bars of iron to play with, had found scattering the seashore fiddles, flutes, saxophones, trumpets, grand pianos by Erhard and Bechstein, and had begun with incredible energy, but without knowing a note of music, to hammer and thump upon them all at the same time.