Letters 101.5

Believe me when I say that everything is doubtful, even for those who are prosperous. No one has any right to draw for himself upon the future. The very thing that we grasp slips through our hands, and chance cuts into the actual hour which we are crowding so full. Time does indeed roll along by fixed law, but as in darkness; and what is it to me whether Nature’s course is sure, when my own is unsure?

Seneca, Letters to Lucilius 101.5, translated by Richard Mott Gummere