What does life, the universe, or anything mean? The most likely answer is both daunting and emboldening at once. (Be sure to check the description for related material!)
Sartre’s “Being and Nothingness” - http://www.dhspriory.org/kenny/PhilTexts/Sartre/BeingAndNothingness.pdf
Nietzsche’s “Thus Spake Zarathustra” - http://www.gutenberg.org/files/1998/1998-h/1998-h.htm
Kierkegaard’s “Sickness Unto Death” - http://lib.tcu.edu/staff/bellinger/60023/summary_of_SicknessUD.htm
Dostoyevsky’s “The Brothers Karamazov” - http://www.online-literature.com/dostoevsky/brothers_karamazov/
Simone de Bouvoir’s “The Ethics of Ambiguity” - http://www.marxists.org/reference/subject/ethics/de-beauvoir/ambiguity/