Yes to lots of these, including the one by @Pursefirst, the Watership Down, Harry Potter and Brideshead Revisited ones and Captain Wentworth's letter in Persuasion.
Other favourites are:
Bleak House: 'The one great principle of the English law is to make business for itself. Viewed in this light it becomes a coherent scheme and not the monstrous maze the laity are apt to think it. Let them but once perceive that the purpose of the law is to make business for itself, at their expense, and surely they will cease to grumble'. That might not be exactly right, but it's something like that. I learned it for A level in 1979!
Pride and Prejudice: the whole speech by Mrs Bennet after Lizzy has told her that she is engaged to Mr Darcy, but in particular 'Pray apologise for my having disliked him so much before. I hope he will overlook it' (and lots of other examples)
The Last Chronicle of Barsetshire: a number of passages, but these two are my favourites:
'By this time, Mr Crawley was looking full into Mr Toogood's face, and seeing that his cousin's eyes were streaming with tears began to get some insight into the man's character, and also some very dim insight into the facts which the man intended to communicate to himself. "I do not as yet fully understand you, sir," said he, "being perhaps in such matters somewhat dull of intellect, but it seemeth to me that you are messenger of glad tidings, whose feet are beautiful upon the mountains'.
and the description of Mr Harding's funeral is beautiful. This is a very abridged version:
'Up to this day, no one would have said specially that Mr Harding was a favourite in the town... But, now that he was gone, men and women told each other how good he had been. They remembered the sweetness of his smile, and talked of loving little words which he had spoken to them... In the transept they were joined by another clergyman whom no one had expected to see that day. The bishop was there, looking old and worn... since his wife's death, no one had seen him out of the palace... But there he was, and they made way for him into the procession behind the two ladies, and the archdeacon, when he saw it, resolved that there should be peace in his heart, if peace might be possible... And so they buried Mr Septimus Harding, formerly Warden of Hiram's Hospital in the city of Barchester, of whom the chronicler may say that that city never knew a sweeter gentleman or a better Christian' .
I must be due another re-read!