When Sri Caitanya Mahaprabhu returned from Gaya after His initiation, He had become a devotee. It is said that the Lord had first stopped on the way and was chanting the Gayatri Mantra, and as He was chanting the Gopal Mantra, He had the darshan of Gopal and then Gopal disappeared. So this was a great shock and from that moment on, He was overwhelmed by separation and when He came back He could only think of Krsna. We remember that He was teaching His students sanskrit grammar and that He explained every word, every word to mean Krsna. Nothing but Krsna.
(Kadamba Kanana Swami , Radhadesh 04/2010)