Like a deft surgeon of secrets, you could extract mine from me, painlessly. So fast, so precise – you knew right where to make the incision and how to sew me back up. Never before had I felt so understood. You had every mystery in hand.
It’s different now. Maybe you have extracted all the mysteries there were. Maybe you stopped wondering what my secrets were or what I was thinking. So in the intervening years, I’ve grown quite a few new secrets and mysteries. There’s a world in me now that you don’t understand and don’t seem to want to. I could pluck them out myself – but what would be the point? I let the mystery grow, like moss on a stone, expanding on the inside – unseen, unknown and well hidden.
The Hamlet Project 
“You would pluck out the heart of my mystery” refers to the savagery of Tyburn when the executioner carried out the sentence of hanging drawing and quartering of Catholic priests, which involved cutting out the heart and brandishing aloft to the crowd. Hamlet is a play about the Reformation – thus the talk of Wittenberg and the central motif of Clausius’s sacrilegious marriage – allusion to Henry VIII.