Letters 117.28

How, I ask you, can that which is still nothing be already a Good? And in what better way do you wish it to be proved to you that a certain thing is not, than to say: “It is yet to be”? For it is clear that something which is on the way has not yet arrived. “Spring will follow”: I know that winter is here now. “Summer will follow:” I know that it is not summer. The best proof to my mind that a thing is not yet present is that it is yet to be.

Seneca, Letters to Lucilius 117.28, translated by Richard Mott Gummere