Time & the Present Moment
To lose someone you love is something you'll regard as the hardest of all blows to bear, while all the time this will be as silly as crying because the leaves fall from the beautiful trees that add to the charm of your home. [...] At one moment chance will carry off one of them, at another moment another; but the falling of the leaves is not difficult to bear, since they grow again, and it is no more hard to bear the loss of those whom you love and regard as brightening your existence; for even if they do not grow again they are replaced. "But their successors will never be quite the same." No, and neither will you.
Seneca
Letters from a Stoic