Harry Potter and the Deathly Hallows
How we cite our quotes:
"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.
"Has anyone ever tried sticking a sword in Voldemort? Maybe the Ministry should put some people on to that, instead of wasting their time stripping down Deluminators or covering up breakouts from Azkaban. So this is what you've been doing, Minister, shut up in your office, trying to break open a Snitch? People are dying – I was nearly one of them – Voldemort chased me across three counties, he killed Mad-Eye Moody, but there's been no word about any of that from the ministry, has there? And you still expect us to cooperate with you!" (7.115)
Here, Harry really seizes the opportunity to lambast the Minister of Magic, Rufus Scrimgeour, for not taking action – it's clear that Harry's decision to act on his own is far removed from the official stance of the Ministry.
"I – I made a grave mistake in marrying Tonks. I did it against my better judgment and I have regretted it very much ever since… Don't you understand what I've done to my wife and my unborn child? I should never have married her, I've made her an outcast!" (11.64-66)
Lupin is tortured by the idea that he might have already ruined his unborn child's life, simply through his werewolf nature. However, Harry reminds him that a choice that's been made cannot then be unmade – after all, Lupin married Tonks because he loves her, and there's nothing he can do to get rid of that bond.