Duty
Duty impresses a structured hierarchy onto our lives. Duty never says, “You be you,” or “Go ahead and do what makes you happy.” Duty says, “This is who you are; do what is required.”
C. R. Wiley, The Household and the War for the Cosmos
I felt this was the key difference between the movie and book versions of A Wrinkle in Time, and perhaps many other such pairs as well.
See also: Self-control
I gotta have my orange juice. 
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