Christ's victory and his resurrection has secured eternal life for all his people, body and spirit! We will not be bodiless spirits, but resurrected and glorified humans made fit for eternity. What we have now is temporary. We look forward to what is permanent. Knowing what's ahead, we shouldn't cling to this life, but rather groan with creation "for our adoption as sons, the redemption of our bodies." So why are you so often cast down? Hope in God.