"When you live, tell truth and shame the devil" writ an essay on this proverb
Answers
Throughout the human history, sapiens has shown specific inclination towards dualism: god and devil, truth and falsehood, good and bad, male and female. Why not nothing in between and just two extremes? Psychologically, human minds percieve most of the entities as dual and this in case can explain increasing intolerence amongst us. This can be a proof that holds for opinion that all concepts building on dualism is just another human creation.
An honest observation to put forth would be that there is no action or doing that is completely good or bad, or againist devil or god. Any action you do leads to another chain of events that is either good or bad or something in between. The narrow vision of an action being categorized into a two-row matrix is moral disinformation and has evolved into a full-fledged duel.
You lie or say truth, every information has seeds of lie and truth embedded in itself. Thinking this way, determining something as true or false is inconclusive and inexpicable. You lie or say truth, nor god neither devil will give a dam,n. At the end of the day, it's just you who should take care of yourself. Do what you wish. Dont fear anything or anyone.
I know it isn't helpful for you but it might be useful.