My family owned an apple orchard with over 20 different varieties of apples. Early season apples, that came ripe in late summer, were very welcome from the store bought apples that had been kept in Controlled Atmosphere storage for months. However the later season apple varieties are far superior in crispness, storage ability, flavor, etc. As welcome and tasty as those early season Beacon apples were, they were merely a foretaste of what was to come later (Regents, Honeygolds, Sweet 16’s). So too, when Paul describes the "first fruits" of salvation, what we now experience as a Christian is only a small taste of the glories and wonders of Heaven and what we’ll experience in our glorified bodies.