"Richard Gombrich agrees that the four Nikāyas and the main body of monastic rules present "such originality, intelligence, grandeur and—most relevantly—coherence, that it is hard to see it as a composite work" and thus concludes that it is the work of one genius, even if he agrees that when it comes to the Buddha's biography "we know next to nothing".Peter Harvey affirms that the four older Nikāyas preserve an "early common stock" which "must derive from his [the Buddha’s] teachings" because the overall harmony of the texts suggest a single authorship, even while other parts of the Pali canon clearly originated later.