Letters 29.9

So while I prepare myself to deal with Marcellinus, do you in the meantime, who are able, and who understand whence and whither you have made your way, and who for that reason have an inkling of the distance yet to go, regulate your character, rouse your courage, and stand firm in the face of things which have terrified you. Do not count the number of those who inspire fear in you. Would you not regard as foolish one who was afraid of a multitude in a place where only one at a time could pass? Just so, there are not many who have access to you to slay you, though there are many who threaten you with death. Nature has so ordered it that, as only one has given you life, so only one will take it away.

Seneca, Letters to Lucilius 29.9, translated by Richard Mott Gummere