We have to become godly. If we don't truly possess the attributes of godliness but expect to just get eternal life, we are like a high-school kid who just got a C- in his general chemistry class, but wants to win a Nobel Prize for formulas on activation energy or thermodynamics. This kid will have a long way to go before he can even understand what activation energy means, let alone get a Nobel Prize. This is like us.
God is like the master chemist who has infinite "Nobel Prizes in chemistry". He has studied and researched and tested and tried and published and fought for His knowledge of chemistry. Even if we are the kid with a C- in general chemistry, we can still become that "Nobel Prize" winner. But we must understand that this endowment will only come after countless hours of "study and mastery". We basically have to become one with chemistry. We have to make the periodic table of the elements our own. Memorize it back to front and be able to recreate it if needs be. It is a part of us. We would have to publish countless papers, and present at countless chemistry conferences and write a score of academic volumes on the subject. It would be who we are. No longer a mere child, experimenting with liquid nitrogen to make ice cream - but a master chemist. We become godlike (AKA have a godlike life = eternal life) when we have become one with all things pertaining to godliness. It is possible for anyone. But they have to believe that it is possible to become a master chemist - a godlike "Nobel Laureate" - if you will.
This is the closest I can get to coming up with a comparison to being endowed with eternal life. I will include more about this in the chapter called "Eternal Living" of the book Live My Gospel. You will soon be able to find more here.