The concept of suffering is continually mentioned:
- "Yikes. I better let you get back to...the suffering" - Maggie to Hunter.
- "I will tell all of them that which you have hidden from them. Your deception, and the suffering it has caused" - Irina to Abraham. 
- "Someday our suffering will be over" - Clarkson to Fortunato Medeiros.
- "We have suffered here for a long time"-Vanessa Richmond
- "What if [...] All that pain, all that suffering was a necessity?"-Susan Dagney to Casey Blevins