i suggest reading this quote through a positive perspective pointing to the possible Human that as part of being-alive dares asking himself again & again the very simple basic questions:
Who Why & What am i .. ?? ..

How ironic, I am in the middle of writing a paper for my philosophy class about the question "who am I"

good Q .. )) glad 2hear it holds some immediate relevance ...
possible 2try approach an answer by playing & changing "who" with "what" thus: what am i ? or what am i made of ?? ..

I didn't even know that quote, yet it is one I live by every day.

There are two ways to slide easily through life; to believe everything or to doubt everything. Both ways save us from thinking.

Alfred Korzybski (1879 - 1950)

"When in doubt, observe and ask questions. When certain, observe at length and ask many more questions." -- George S. Patton (1885 - 1945)