"I am grieved by the transitoriness of things," wrote Friedrich Nietzsche in a letter to Franz Overbeck, dated 24 March 1887. (Quoted in R. Hayman, Nietzsche: A Critical Life, Penguin, 1982, p. 304)
While we are saddened by the transience of things, that they are transient shows that their passing is not worthy of the full measure of our sadness. You are saddened by loss, but what exactly did you lose? Something that was meant to last forever? Something that could last forever? Something that was worth lasting forever?
Sadness at the passing of what must pass often indicates an inordinate love of the finite, when an ordinate love loves it as finite and no more. But sadness also bespeaks a sense that there is more than the finite. For if we had no sense of the Infinite why would we bestow upon the finite a value and reality it cannot bear?
Sadness thus points down to the relative unreality and unimportance of the world of time and change while pointing up to the absolute reality and importance of its Source.
But Nietzsche, of the tribe of Heraclitus, could not bring himself to believe in the Source. His bladed intellect would not allow it. But his heart was that of homo religiosus. So he had resort to a desperate and absurd measure in reconciliation of heart and head: the Eternal Recurrence of the Same, as if the redemption of time could be secured by making it cyclical and endless.
This is no solution at all.
The problem with time is not that it will end, but that its very mode of Being is deficient. The problem is not that our time is short, but that we are in time in the first place. For this reason, more time is no solution. Not even endlessly recurring time is any solution. Even if time were unending and I were omnitemporal, existing at every time, my life would still be strung out in moments outside of each other, with the diachronic identifications of memory and expectation no substitute for a true unity.
To the moment I say, with Faust, Verweile doch, du bist so schön (Goethe, Faust) but the beautiful moment will not abide, and abidance-in-memory is a sorry substitute, and a self diachronically constituted by such makeshifts is arguably no true self. Existing as we do temporally, we are never at one with ourselves: the past is no longer, the future not yet, and the present fleeting. We exist outside ourselves in temporal ec-stasis. We are strung out in temporal diaspora. The only Now we know is the nunc movens.
But we sense and can conceive a nunc stans, a standing now. This conception of a standing now, empty here below except for the rare and partial mystic fulfillments vouchsafed only to some, is the standard relative to which the moving now is judged ontologically deficient. Time is but a moving and inadequate image of eternity.
So we of the tribe of Plato conceive of the divine life as the eternal life, not as the omnitemporal or everlasting life.
We too weep with Heraclitus, but our weeping is ordinate, adjusted to the grade of reality of that over which we weep. And our weeping is tempered by joy as we look beyond this scene of flux. For as Nietzsche says in Zarathustra, "all joy/desire wants eternity, wants deep, deep, eternity." All Lust will Ewigkeit, will tiefe, tiefe, Ewigkeit!
This longing joy, this joyful longing, is it evidence of the reality of its Object? Great minds have thought so. But you won't be able to prove it one way or the other. So in the end you must decide how you will live and what you will believe.