Carefully studying the sentences word by word,
one should trace them in the Discourses (Sutras)
and verify them by the Discipline (Vinaya).
If they are neither traceable in the Discourses
nor verifiable by the Discipline,
one must conclude thus, certainly,
this is not the Blessed One’s utterance.
— Sakyamuni Buddha
(Maha-parinibbana Sutta)