“It is folly to think we can pursue impure lives, while planning to repent at the end, and thus escape hell at the last minute. This is folly because a lifetime of impurity will have clouded the lens of the soul so badly that it is highly unlikely that suddenly Jesus will appear beautiful at the end. On the contrary, he will probably appear terrifying as you die, and a lifetime of impure preferences for other things above him will probably leave you hardened like Esau (Hebrews 12:17), not tender like the thief on the cross (Luke 23:43). The pursuit of purity now, not in the hour of your death, is the mark of a true Christian.” – John Piper

I think you become like what you love and desire. Your thoughts and actions change you into what you will be. “Be transformed by the renewing of your mind.”