Why?

I still dont get this movie. I have seen it 6 times already. But every time I watch it i get into more thoughts of what did Scorsese mean? what did it mean?What was his point?

MEAN STREETS. THE MARTIN SCORSESE CLASSIC

"You don't make up for your sins in church; you do it in the streets; you do it at home. The rest is bulls--t, and you know it."
NOTHING BUT A 5 ON 5. WHAT ELSE TO SAY. BRILLIANT. MARTIN SCORSESE'S FIRST MAJOR MOVIE. BLOODY GOOD. HARVEY KEITEL. UNMISTAKABLY ONE OF ROBERT DE NIRO'S BEST PERFORMANCES.

MARTIN SCORSESE

If u have ever seen those crazy people who would faint at the sight of their "idols", then I would be one of them only if i see this man in person. MARTIN SCORSESE. The cinematic god behind TAXI DRIVER, THE DEPARTED, CASINO, GOODFELLAS, RAGING BULL, MEAN STREETS, THE KING OF COMEDY, THE AVIATOR, GANGS OF NEW YORK,etc.