Buddhist Dictionary of Pali Proper Names by G P Malalasekera
Uddesavibhanga Sutta
Uddesavibhanga Sutta:The Buddha utters the brief statement that a monk should always so guard his mind that it may not be externally diffused nor internally set.The monks repeat this statement to Mahā Kaccāna,who gives a detailed exposition thereof.When the Buddha is told of Kaccāna’s explanation,he praises his erudition (M.iii.223ff).