Of COURSE someone can be converted back to the right path in this mortal life.
How many times do people give up and then decide a little while later 'actually, no I won't give up' and make a better go of things? All the time! And Good for them!
But if we were to have tasted the gift of heaven and the power of the future world (ie. The renewed earth) and still sinned, we'd not be able to reverse that, in otherwords, when we go to the new earth all immortal and shiny and pure, it's for keeps.
How many times do people give up and then decide a little while later 'actually, no I won't give up' and make a better go of things? All the time! And Good for them!
But if we were to have tasted the gift of heaven and the power of the future world (ie. The renewed earth) and still sinned, we'd not be able to reverse that, in otherwords, when we go to the new earth all immortal and shiny and pure, it's for keeps.