10 The heavens themselves do not always shine with the globes of twinkling stars, wherewith as with coronets they are adorned. They are not always growing bright with the dawn of light, or ruddy with the rays of the sun; but in constant succession that most pleasing appearance of the world grows dark with the damp chill of night. What is more grateful than the light? What more pleasant than the sun? Each of which daily comes to an end; yet we do not take it ill that these have passed away from us, because we expect them to return. You are taught in these things what patience you ought to manifest with regard to those who belong to you. If things above pass away from you, and cause no grief, why should the passing away of man be mourned?
Source: On the Death of Satyrus (New Advent)