Is there a certain bible verse, quote, poem that you live by?

Do onto others, as you would have them do onto you.

Might be hard to narrow it down to one Bible verse so here's a couple.
We know that all things work together for the good of those who love God: those who are called according to His purpose. Romans 8:28
For I know the plans I have for you"--this is the LORD's declaration--"plans for your welfare, not for disaster, to give you a future and a hope. Jeremiah 29:11
But if not... Daniel 3:18 This one is from a story where three men were about to be put to death for worshipping God. They tell the king who is going to kill them that their God is able to save them. But they realize that God does not have to save them. So they continue that even if God does not save them, they will stay faithful to Him to the end. Those three words serve as a reminder that God can do all things, but should He choose not to save me from something, I will still be faithful.
*This was also the message sent by the trapped British troops to the people back home at Dunkirk.

Thats an interesting thought. I've always been rather fond of "Be careful what you wish for, you might actually get it", lol.