Gregory of Nyssa

The sea is a receptacle for water which tends to flow everywhere; water never ceases to flow while the sea never grows larger. What is the goal of the water's course which always fills the unquenchable sea? What is this influx of water which never fills the ever-constant sea? Ecclesiastes speaks like this that he may explain the insubstantiality of our frenzied pursuits which result from elements constituting man's existence. If the sun's course consists in this, it too has no limit; neither is there any succession between day and night, and the earth is condemned to remain ever unmoved. The rivers also labor in vain, for they are consumed by the insatiable sea which receives this constant inflow to no avail. If this is true, what about man who is subject to such elements? Why are we astonished at the rise and fall of a generation which follows a natural course because a generation of men always succeeds the one before it and so forth? What does Ecclesiastes cry out to the church? That you, oh man, who contemplate the universe, should understand your own nature. The wonders you behold in heaven or on earth, the sun or sea, should help explain your human nature. Sunrise and sunset resemble our human nature because they both have in common the one course [circle] of life. When we come into existence, we later return to our natural place. Once our life sets, our light passes under the earth which then lays hold of it.

The time of your struggle is short. Do not be more inanimate than the earth nor more foolish than [beasts] which lack feeling, for you are endowed with reason and the capacity to administer. Rather, as the Apostle says, "Continue in the things which you have learned and have been assured of" in steadfastness and constant stability. Since these words refer to the divine commands, "be steadfast and unmovable," allow temperance to abide in your life along with firm faith, constant love and stability in every kind of beauty, that you may resemble the earth's eternal stability. If anyone is greedy like the ocean with its expansive, boundedness desire which the inflow of waters cannot satisfy, let one be cured of his illness by looking upon the ocean. In this way he will not transgress his own bounds in the multitude of waters but will retain the same fullness without the addition of more water. In similar fashion pleasures arising from human nature with its present limit cannot expand its gluttonous appetite to keep pace with their great number; rather, the influx [of pleasures] does not cease even though our capacity for enjoyment is limited.