Augustine of Hippo
Therefore, we are members of the King, Christ, who is our Head and Sovereign. You have granted Him days upon days, not just during the time that has a conclusion but also in the ages that stretch endlessly beyond. He has declared, “I will abide in the house of the Lord for many days.” What is the essence of eternity, if not the acknowledgment that our days are now briefer? Everything that has a conclusion is fleeting; yet with this King, days continue endlessly, meaning that Christ will rule within His Church not only throughout these passing days, but the Saints will also reign alongside Him in the ages without end.
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Concerning the nature of God, it is written: “But Thou art the same, and Thy years shall not come to an end.” Just as time is measured in years, so too are our days; even one single day reflects this truth. Whatever you articulate about eternity falls short of its true depth. It is necessary to express something in order to grasp the incomprehensible. This parallels both the day of our physical birth and the promise of rebirth. Each generation is likened to the moon; for just as the moon undergoes phases—new, waxing, full, waning, and fading—so do these mortal generations. Yet, in the generation that we will enter through resurrection, we shall dwell eternally with God, transformed from being like the moon to something akin to what the Lord describes: “Then the righteous shall shine forth as the sun in the kingdom of their Father.” (Matt. 13:43) Here the moon signifies the transitory nature of our earthly existence.