Meaning of “They spend life in making ready to live!”

The present has to be used while it is available because delay does not pause the day that is already moving away.

Seneca warns that postponement is itself a use of finite life: waiting for a more convenient future can become the very way the available present is lost.

Delay is costly because it exchanges a real day for a future that remains uncertain and therefore cannot be spent yet.

Mortality is used to challenge postponement: limited time makes present conduct more important than fantasies of an indefinitely extended future.

Seneca argues against postponing life into an imagined future and asks the reader to treat the present day as complete enough for deliberate living.

Time often disappears without a dramatic signal, which makes ordinary attention more important than waiting for a crisis to announce that life is passing.