for there shall arise false Christs and false prophets, and shall show signs and wonders, that they may lead astray, if possible, the elect.

Because there will be false Christs and false prophets, and they will give signs and wonders in the hope of turning even the saints from the true way.

Διοτι θελουσιν εγερθη ψευδοχριστοι και ψευδοπροφηται και θελουσι δειξει σημεια και τερατα, δια να αποπλανωσιν, ει δυνατον, και τους εκλεκτους.

For false Christs and false prophets shall rise, and shall shew signs and wonders, to seduce, if it were possible, even the elect.