"I got a million recipes how to cure it.  None of them work."  From Dark Shadows episode 35.

"The whole idea is preposterous and idiotic."  From Dark Shadows, episode 167.

"The gray light of early morning brings no relief."  From Dark Shadows episode 5.

"You see, the gods told him the secret magic number of the universe, the number which unlocks all the rules that bind you mortals to your daily dull lives.  The number is whispered so deeply into the soul that no one can remember it without using the magic."  From Dark Shadows episode 358.

"I know that sounds tactless, but I said it deliberately."  From Dark Shadows episode 463.

"Why not dance a voodoo dance around a hospital table, chanting semi-guttural noises."  From Dark Shadows, episode 167.

"Maybe nothing.  Maybe everything."  From Dark Shadows episode 154.

A black magick incantation from Dark Shadows episode 762.  "I call upon the flame to summon you. I call upon the raven and the bat and all the dark creatures of nature, upon the charred and blackened clouds that reigned at your beginning." 

"They sink to the bottomless depths of corruption."  From Dark Shadows episode 210.

"I am what I've become.  I'll do nothing."  From Dark Shadows episode 7.

A hint of actor fatigue in the long-running Dark Shadows: "I've had just about enough of this nonsense I didn't write" (ep. 50) and "Nothing seems to go right, ever!" (ep. 56).

"That was before this."  From Dark Shadows episode 21.

"Ghosts and demons."  From Dark Shadows episode 14.  There was also that time that Liz Stoddard said the single word "Goblins," here.

"What do you want me to believe?"

"Nothing."

"All right, I believe it."

From Dark Shadows episode 53.

"Enveloped by a ghostly secret."  From Dark Shadows episode 1085.

"On this night, a kind of madness prevails."  From Dark Shadows episiode 364.

From Dark Shadows episode 658.

"I have lived so long expecting everyone to be able to do everything."  From Dark Shadows episode 495.

"Devils, be humbled."  From Dark Shadows episode 519.

"I don't know why I ever thought I could get through this."  From Dark Shadows episode 695.