to an incorruptible and undefiled inheritance that doesn't fade away, reserved in heaven for you,
And that fadeth not away ... The fading nature of all earthly and temporal things contrasts with the eternal reward of the saints in Christ Jesus.  No matter what wealth, honor, power, glory, popularity, beauty, or success may come to one on earth, it is only for a moment.  All of the strength, achievement, and desire of mortals quickly end in the tomb, fading away, and are soon forgotten by the fleeting generations of people; but not so the everlasting inheritance of the saints in light.