Some music I was listening to made me think about the movie Amadeus
... For those who haven't seen it, the movie is a fictionalised account of the life of Wolfgang Amadeus Mozart, seen through the eyes of the protagonist anti-hero Antonio Salieri. In the movie, Salieri is the hard-working but merely competent composer, Mozart the inspired musical genius. Salieri's initial admiration for Mozart's genius turns to jealous hatred when arrogant brat Wolfie casually seduces and then discards the girl that Antonio had the hots for, but his hatred only turns murderous when he finds out how Mozart effortlessly "channels" music, a level of genius that Salieri, despite his best efforts, could never hope to match.
I was actually quite sympathetic to Salieri's feelings when I watched the movie. He went a little overboard by targetting Wolfie when his quarrel was really with God for unfair distribution of talent, but I could feel for his frustration at raw genius being valued over hard work.
One possible reading of the story could be that Salieri acts like he feels entitled to grace, or talent, success or whatever you want to call it. Just because he worked hard and followed the rules, he thinks he deserves what Wolfgang has without any of that effort. He seems understandably upset, because he's discovering that he's been sold a bunch of bullshit. Work hard and you'll be rewarded. Be good and bad things won't happen to you. The usual social hoax, presented to him as a divine promise.
"Salieri believes that through his hard work, his worship and chastity he has deserved God's grace. Accordingly, he takes it for granted that his wish to be the world's greatest composer will be fulfilled. When Mozart arrives on the scene, Salieri realises that his offering has been rejected and God's miraculous gift of composing eternal music bestowed upon his rival. He becomes aware that God's preference is arbitrary and does not depend on any business agreement. This sudden and bitter realisation has violent consequences: just like Cain decided to kill Abel after his gift had been rejected, Salieri now decides to destroy Mozart, the undeserving beneficiary of divine grace."