In nomine dei nostri Luciferi excelsi
Primo morimur tum vicerimus

It’s short, but it’s meaningful to me.
first line reads: In the name of our god, Lucifer, the most high
second line reads: First death, then we conquer

note that Luciferi is pronounced differently in Latin than it may look to an English speaker, think of how you pronounce the ch in “mooch” then add a “Loo” sound before it. So “Loo-che-fair-ee”
“First death, then we conquer” is a callback to his fall. The death is not a literal death, but a figurative one. We may lose, but we will end victorious.

typically I’ll repeat this prayer 6 times before sleeping. Followed by a personal prayer to Lucifer just talking to him. Then followed by repeating “Venerate Lucifer” 6 times… Thus making 616. It may be cliche, but it makes me feel better.