The gods envy us. They envy us because we’re mortal, because any moment may be our last. Everything is more beautiful because we’re doomed. You will … - Homer

Everything is more beautiful because we are doomed. You will never be lovelier than you are now. We will never be here again.

Come, Friend, you too must die. Why moan about it so?
Even Patroclus died, a far, far better man than you.
And look, you see how handsome and powerful I am?
The son of a great man, the mother who gave me life — A deathless goddess. But even for me, I tell you,
Death and the strong force of fate are waiting.
There will come a dawn or sunset or high noon
When a man will take my life in battle too — flinging a spear perhaps
Or whipping a deadly arrow off his bow.

The Iliad of Homer, trans. Alexander Pope (1720)

Man is the vainest of all
creatures that have their being upon earth. As long as heaven
vouchsafes him health and strength, he thinks that he shall come to
no harm hereafter, and even when the blessed gods bring sorrow upon
him, he bears it as he needs must, and makes the best of it; for
God Almighty gives men their daily minds day by day. I know all
about it, for I was a rich man once, and did much wrong in the
stubbornness of my pride, and in the confidence that my father and
my brothers would support me; therefore let a man fear God in all
things always, and take the good that heaven may see fit to send
him without vainglory.