As these passages are all from the discourses I do not wish to say that they may not be taken from other Gospels than the canonical, but we have absolutely no evidence that they were so taken, and every additional instance increases the probability that they were taken directly from St.Matthew, which by this time, I think, has reached a very high degree of presumption.
I have reserved for a separate discussion a single instance which I shall venture to add to those already quoted, although I am aware that it is alleged on the opposite side.

Justin has the saying 'Let your yea be yea and your nay nay, for whatsoever is more than these cometh of the Evil One' ([Greek: Mae omosaete holos.

Esto de humon to nai nai, kai to ou ou; to de perisson touton ek tou ponaerou]), which is set against the first Evangelist's 'Let your conversation be Yea yea, Nay nay, for whatsoever is more than these cometh of the Evil One' ([Greek: ego de lego humin mae omosai holos...

Esto de ho logos humon nai nai, ou ou; to de perisson, k.t.l.]).

Now it is perfectly true that as early as the Canonical Epistle of James (v.