RobH_en_tn/2ti/02/18.md

who have gone astray from the truth

Here "gone astray from the truth" is a metaphor for no longer believing or teaching what is true. Alternate translation: "who have started saying things that are not true" (See: rc://en/ta/man/translate/figs-metaphor)

the resurrection has already happened

"God has already raised dead believers to eternal life"

they destroy the faith of some

"they cause some people to stop believing"