A quote I liked from chapter 2 of How to Read Literature Like a Professor was "The thing we share is our death...Next to our mortality, which comes to great and small equally, all the differences of our lives are mere surface details."
As much as the other notable and bold quotes in the first two chapters, this topic - the subject of death and human demise - is something that is common to everyone. We never know our time, and most of us fear death itself, as well as the thought of what may be after our demise. 50 people could be given the topic of death and all write something different. It's remarkable.