Quote 1
"There have been too many mistakes where Harry Potter is concerned. Some of them have been my own. That Potter lives is due more to my errors than to his triumphs." (1.32)
Voldemort here is certain that everything that happens is up to him – and nobody else. The only choices that matter in his mind are his own, a belief that really betrays his arrogance.
Quote 2
"One of us?" jeered Voldemort, and his whole body was taut and his red eyes stared, a snake that was about to strike. You think it will be you, do you, the boy who has survived by accident, and because Dumbledore was pulling the strings?"
"Accident, was it, when my mother died to save me?" asked Harry. […] "Accident, when I decided to fight in that graveyard? Accident, that I didn't defend myself tonight, and still survived, and returned to fight again?"
"Accidents!" screamed Voldemort, but still he did not strike. […] "Accident and chance and the fact that you crouched and sniveled behind the skirts of greater men and women, and permitted me to kill them for you!" (36.95-97)
Yet again, Voldemort makes the fatal error of underestimating the choices and deliberate actions of others, assuming that only his choices matter.
Quote 3
"I regret it," said Voldemort coldly.
He turned away; there was no sadness in him, no remorse. It was time to leave this shack and take charge, with a wand that would now do his full bidding… Voldemort swept from the room without a backward glance… (32.121)
Voldemort's true depths of evil are really revealed by his callous murder of Snape, who he thought was his faithful servant all these years. He truly has progressed beyond "the usual evil" – he's past all human feeling.