Honestly for me, I almost take comfort in this thought. Everything is temporary. Enjoy it as you can. Nothing will matter soon - so who cares if you make mistakes, nobody can possibly judge you. There is no objective other than what you decide to aim for, so just go and live life :)
Consider the alternative possibility that everything is permanent, in a sense. Every habitual response, your actions, dialogues and relationships ... everything... is etched in a type of eternal hologram which you will live throughout eternity. Not unlike the experience of dreaming.
This is and was a common conclusion of mystics the world over, clothed in different words.
I went through a similar existential conclusion and tried to impart the sentiment to some of my friends. Reactions ranged from mixed to negative. Some people exist and thrive in structure. It made me a little sad. It takes a certain optimistic mindset to carry this idea forward, otherwise it seems entirely nihilistic.
No problem, I really like it, it's a very simple app.
I rarely actually open it to see the quotes.
I recently gave in and got a fitness tracker, most apps I blacklist for notifications, but it's nice to whitelist this so that throughout the day my watch reminds me I'm going to die :)