Downton Abbey, Lavinia's funeral

Downton Abbey, Season 2, Episode 8.

Reverend: Earth to earth, ashes to ashes, dust to dust; in sure and certain hope of the Resurrection to eternal life, through our Lord Jesus Christ; who shall change our vile body, that it may be like unto His Glorious Body, according to the mighty working, whereby He is able to subdue all things to Himself.

(shall is used instead of will to emphasize that something will definitely happen - it's an old fashioned, especially British English formal use) 

(unto = to, old fashioned)
(mighty = very strong and powerful)
(whereby = by means of which)

(subdue = to defeat or control using force)

Dick Turpin, The wish is father to the thought

Dick Turpin, Season 1, Episode 8. The Upright Man

Dick Turpin: To the upright man!

Tyson Sarney: Dick! By Heaven! Oh, thank God you're back! We thought you'd    been captured.

Dick Turpin: And the wish is often father to the thought.

(which means that the thought is born from the wish, because the "upright" man has betrayed Turpin and he's astonished to see him back) 

(upright: always behaving in an honest way)

To learn more about this saying do visit the english club related page.

Downton Abbey: When Mr. Bates is arrested

You are under arrest on the charge of wilful murder. 

You are not obliged to say anything unless you desire to do so. 

Whatever you say will be taken down in writing and may be given in evidence against you upon your trial.

Common error about making/doing business

Please do not say "make business", say "do business"
It's a common error

downton abbey: the end of second season

Matthew: Would you stay, if I ask you to? 
Mary:  Matthew, don't be mad. You know by yourself ...we ...carry more luggage.... And what about the late Mr. Pumoke? Won't he resurrect himself every time we argued?
Matthew:  No.
Mary:  You mean you've forgiven me.
Matthew:  No, I haven't forgiven you.
Mary:  Well, then?
Matthew:  I haven't forgiven you because I don't believe you need my forgiveness. You've lived your life and I've lived mine. Now it's time we lived them together.
Mary:  We've been on the edge so many times Matthew. Please don't take me there again unless you're sure.
Matthew:  I'm sure.
Mary:  And your vows to the memory of Lavinia?
Matthew:  I was wrong. I don't think she wants us to be sad. She was someone who never caused the ... of sorrow in her whole life.
Mary:  I agree.
Matthew:  And, will you...?
Mary:  You must say it properly. I won't answer unless you kneel down and everything.
Matthew:  Lady Mary Crowley, will you do me the honour of becoming my wife?
Mary:  Yes.