"Fear ye eat the head and leave the brains for fleeting, passing, uncaring Jules when you could wretch them out from thy nose."

"I fear thee fear ye own brains. Fetch me a hook, chimmy!."

"Fetch thy own hook if you think thee capable of such deeds."

"Curse ye legs to an eternity of no use, my friend. And damn your mouth to be the equivalent of your mother's."

Author's note/

Since the world has not used such English in about 400 years I shall elaborate:)
It is about a rather mentally-challenged heathen named Dickon
He is employed by a rich Quaker called Jules
And his job as a fisherman, is to catch fish for the Quaker family
And he is speaking to his friend Michael

What went on was that Michael could not understand why Dickon used such a tedious method to catch the fish from the ponds
What Dickon did was to wade in the water and attempt to stop them in their paths with his hands
Quite stupid indeed
So in the first statement Michael used a metaphor

"Fear ye eat the head and leave the brains for fleeting, passing, unloving, Jules"
Means "I am afraid you harm yourself by using such a stupid method, just so you can give the good portion of what you reap to Jules."
And Dickon, being dreadfully mentally-challenged, thinks Jules is asking him to murder someone
And he is so shocked and disappointed, he is about to murder Michael for even suggesting that
Which shows how stupid he is, because he is about to do the same thing he was fussed about never doing

So in the second statement, he asks him to "Fetch a hook" so he can pull Michael's brains out in revenge for asking him to murder someone
And in the third statement
Well, a hook is used at the end of a fishing line
So Michael think that Dickon is asking him to fetch a hook

But Michael feels that he should not be helping Dickon any more, as he came up with the idea in the first place
So he asks him, quite rudely, to get his own hook if he is capable of changing his ways
And in the last statement
Dicken curses him to become paralysed, and to speak like his mother
And being mentally-challenged, he does not know that Michael's mother is a well-respected woman who happens to be a regular at Paris's social scene
And he does not realise that Michael, unfortunately, is indeed paralysed from the waist down