Some people would say it was always there. Some historians think that it might have even been in reaction to Muslim influence where there was this devotion or this surrender to a notion of God. Some historians think that it co-developed with Sufi Islam, which is all about devotional love for God. But needless to say, as we go through the Indian Middle Ages, the bhakti movement gains more and more momentum and is really the defining movement for Hinduism today. And just to get an appreciation for some bhakti text, here is an excerpt from the Bhagavad Gita, which is considered by many modern Hindus to be one of their most central scriptures. It was likely written over 2,000 years ago and really came into its final form during the Gupta Empire. But the Gita is considered one of the central bhakti texts.