How can we be sure of this? Do we know for sure that our eternal life begins in this physical life and then continues on once we pass from these physical bodies? We make bank transfers and trust the people who develop the technology that these transactions will be completed properly. If we trust mere mortals with bank transfers then can we trust God with the transfer of our souls? A.W. Pitzer viewed the confidence we have in this life with each other compared to our confidence in God:

Yet the moment we speak of confidence, trust in God, men at once declare their inability to comprehend the meaning of this faith. But the faith in its essence as a human act is the same; the personal object is different. In the one case it is our fellowman; in the other, it is God. If a man is able to know what it is to have confidence in a fellow-mortal, surely he should have no difficulty in knowing what confidence in God means.[1]

If we are sincere when we make an honest confession to Christ, then His Spirit empowers our spirit to have confidence in His Word. We then have the confidence that our eternal life has started and will continue beyond this physical life.

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[1] A.W. Pitzer, Confidence in Christ: or, Faith that Saves (Philadelphia, PA: Presbyterian Board of Publication and Sabbath-School Work, 1888), 18-19.