Jealousy is perhaps the most involuntary of all strong emotions. It steals consciousness, it lies deeper than thought. It is always there, like a blackness in the eye, it discolours the world.

I have always wanted to kill you, all my life led to that blow. Jealousy and hatred compose my earliest memories. I have killed you every day in my thoughts.

I adore your jealousy, especially when it's so misplaced. I expect Shakespeare wrote a sonnet about that.

If there is any fruitless mental torment which is greater than that of jealousy it is perhaps remorse. Even the pains of loss may be less searching; and often of course these agonies combine, as now they did for me. I say remorse not repentance. I doubt if I have ever experienced repentance in a pure form; perhaps it does not exist in a pure form. Remorse contains guilt, but helpless hopeless guilt which knows of no cure for the painful bite.

But jealousy is a dreadful thing, Jessica. It is the most natural to us of the really wicked passions and it goes deep and envenoms the soul. It must be resisted with every honest cunning and with the deliberate thinking of generous thoughts, however abstract and empty these may seem in comparison with that wicked strength... There is no merit, Jessica, in a faithfulness which is poison to you and captivity to him.

Jealousy is the most dreadfully involuntary of all sins.