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)