Dialogues of the Buddha Vol. I, II, III: Translated from the Pali of the Digha Nikaya

The Digha Nikaya or "the collection of long doctrinary lectures" delivered by the Buddha is first of the five Nikayas or collection belonging to the Suttapitaka or the basket of (Buddha's) discourses which is one of the three major collection of Buddhist texts in Pali, the other two being Vinayapitaka and Abhidbamnapitaka.