Evanthia

“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

“Why do I do anything?' she says. 'I'm educated enough to talk myself out of any plan. To deconstruct any fantasy. Explain away any goal. I'm so smart I can negate any dream.”
― Chuck Palahniuk, Choke

“Every man has his secret sorrows which the world knows not; and often times we call a man cold when he is only sad.”
― Henry Wadsworth Longfellow

“Uncertain of uncertainty, skeptical of skepticism, it seems that the most important question is whether there is an important question.”
― Mitchell Heisman, Suicide Note