"Each devoted to one's own duty, a person attains perfection. Hear how one engaged in one's own duty finds that perfection."
Modern explanation
When the day pushes against you, remember: Mastery comes from a long obedience to the work in front of you, not from constant reinvention.
Practical application
Do the work even when motivation has left the room. Discipline is borrowed motivation.
Reflection question
What would I do if I knew this work was preparing me for something I can't yet see?