“Memory - that fiend, that cruel enemy of comfort.”
“Mr. Heathcliff, you're a cruel man, but you're not a fiend; and you won't, from mere malice, destroy, irrevocably, all my happiness.”
“Better a cruel truth than a comfortable delusion.”
“Comfort is the enemy of achievement.”
“A perfect memory is the enemy of thought.”
“youth runs away from old age, because it is its most cruel enemy”