Marathe and Kate at Ryle's (p. 781)
‘No, but this choice, Katherine: I made it. It chains me, but the chains are of my choice. The other chains: no. The others were the chains of not choosing.’
Context
Marathe's summation, against Kate's protest that a choice you can't unmake is like a gun to your head (her own words: "like the clinical depression was a shotgun nudging you down the wedding aisle"). Chosen chains versus the chains of not choosing is the scene's whole ethics, and the theme's counter-proposal to suicide: the cage can only be traded, never simply exited.