Mark 13:21

καὶ τότε. “It will be a time of great excitement and much fanaticism, and those who are looking for signs will be easily misled; therefore be on your guard against impostors.” In the Sermon Christ points out that at all times, if we want to find the right way, we must beware of seducing guides (Matthew 7:15-20).

Ἴδε ὧδε κ.τ.λ. Mt’s expansion of this is characteristic, as also is Mk’s simplicity.

μὴ πιστεύετε. Not “cease to believe,” as μὴ φοβεῖσθε (Mark 6:50) and μἠ κωλύετε (Mark 10:14), but “continually abstain from believing,” as μὴ προμεριμνᾶτε (Mark 13:11). Mt. here has aorists.