Uncertainty doesn't make life worth living, quite, but it does make striving and gambling worth attempting.

A life lived unexplored is a life not worth living.

Life is an end in itself, and the only question as to whether it is worth living is whether you have had enough of it.

Life isn't worth living if I miss an episode

Life isn't worth living unless you're willing to take some big chances and go for broke.

To be able to look life in the face: that's worth living in a garret for, isn't it?