Balarama and Krishna studied under Guru Saandeepini, offering him the tribute of love and reverence. Giving joy to the teacher, studying well what has been taught, avoiding the pursuit of sensory pleasure and devoting oneself solely for the pursuit of knowledge - they lived by these guidelines.
They never interrupted the discourse of the preceptor or interposed their will against his. They did not overstep his will or direction in any instance. They never challenged his authority or dared disobey his instructions. Though Balarama and Krishna were the repositories of Supreme Authority over Earth and Heaven, they gave their preceptor the respect and obedience that was due to his eminence and position. They were full of earnestness and devotion. They did not allow anything to distract them from their lesson. That is how a good student should be, that is what Balarama and Krishna were! Source : Bhagavatha Vahini, Ch 39, "The Omniscient as Student".
