Concept
Memento Mori
4 books in the library reach for this idea - each in its own way. When independent authors converge on one concept, it usually deserves attention.
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How this book uses it: Use the fact of death to remove trivial urgency and give real commitments a place on the calendar.
Discourses
How this book uses it: Loved ones are mortals on loan. Kiss your child goodnight thinking "You might die tonight." Increases appreciation, softens grief.
Meditations
How this book uses it: Remember you will die. This clarifies priorities instantly. "Let each thing you do be as if it were your last."
The Daily Stoic
How this book uses it: Remember you will die. This clarifies priorities instantly and eliminates pettiness.