Esme

“Toska - noun /ˈtō-skə/ - Russian word roughly translated as sadness, melancholia, lugubriousness.

"No single word in English renders all the shades of toska. At its deepest and most painful, it is a sensation of great spiritual anguish, often without any specific cause. At less morbid levels it is a dull ache of the soul, a longing with nothing to long for, a sick pining, a vague restlessness, mental throes, yearning. In particular cases it may be the desire for somebody of something specific, nostalgia, love-sickness. At the lowest level it grades into ennui, boredom.”
― Vladimir Nabokov

“He broke my heart. You merely broke my life.”
― Vladimir Nabokov, Lolita

“Moral wounds have this peculiarity - they may be hidden, but they never close; always painful, always ready to bleed when touched, they remain fresh and open in the heart.”
― Alexandre Dumas, The Count of Monte Cristo

“We are always in a hurry to be happy...; for when we have suffered a long time, we have great difficulty in believing in good fortune.”
― Alexandre Dumas, The Count of Monte Cristo