“There are more things, Lucilius, likely to frighten us than there are to crush us; we suffer more often in imagination than in reality.”

Letter 13, on groundless fears, Gummere's translation.

Written down the evening before launch, after the pre-mortem, as the opening of 🪷 Rehearsing what could go wrong. Seneca is not saying nothing bad will happen. He is saying the list of fears is longer than the list of events, so walk through the list once, on purpose, and then stop.