“[I]f it were possible, they shall deceive the very elect.” ~ Matt.24:24
This warning implies such deception is not possible! Neither false Christs, nor false prophets, shewing great signs and wonders will be able to sway the saints away from their Saviour. Our Lord is emphatic; it is impossible to deceive His elect. The Good Shepherd tells us, "[My] own sheep… follow [me]: for they know my voice. And a stranger they will not follow, but will flee from him: for they know not the voice of strangers.”
We are told Satan can transform himself into an angel of light. And his apostles and ministers into apostles of Christ, and ministers of righteousness. These may lead the elect sheep temporarily astray, but never permanently away to stay. “Fool me once, shame on you; fool me twice, shame on me.”
By the way, this temptation only works once for a brief time, if even then. For sure, there are no seconds! Shepherds tell us once a sheep is brought back to the fold from straying; they stay close to their shepherd from then on.
“Tell me, O thou whom my soul loveth, where thou feedest, where thou makest thy flock to rest at noon: for why should I be as one that turneth aside by the flocks of thy companions? If thou know not, O thou fairest among women, go thy way forth by the footsteps of the flock…” His sheep follow Him!