A stoic quote by Seneca from Letter XCI

One thing I know: all the works of mortal man lie under sentence of mortality; we live among things that are destined to perish. A setback has often cleared the way for greater prosperity. Many things have fallen only to rise to more exalted heights. When it comes to all we’re required to go through, we’re equals. No one is more vulnerable than the next man, and no one can be more sure of his surviving to the morrow.
― Seneca Letter XCI