‘For I know that my Redeemer lives and at the last he will stand upon the earth. And after my skin has been thus destroyed, yet in my flesh I shall see God, whom I shall see for myself, and my eyes shall behold, and not another (Job 19.25-27).
‘I believe that when I die I shall rot and nothing of my ego shall survive’ (Bertrand Russell).
The only characteristic these two well-known statements share is their expression of certainty. The nature of that certainty is, of course, in each case, massively different.