Seneca · On grief for lost friends
Letters 63.7
For my part, I do not agree with him. To me, the thought of my dead friends is sweet and appealing. For I have had them as if I should one day lose them; I have lost them as if I have them still.
Therefore, Lucilius, act as befits your own serenity of mind, and cease to put a wrong interpretation on the gifts of Fortune. Fortune has taken away, but Fortune has given.
Seneca, Letters to Lucilius 63.7, translated by Richard Mott Gummere