Change starts with a single step, but it takes a collective effort to make it last.
When I look at the world I'm pessimistic, but when I look at people I am optimistic.
The time at our disposal each day is elastic; the passions we feel dilate it, those we inspire contract it; and habit fills up what remains.
Never stop learning—the moment you think you know everything is the moment you start falling behind.
If you want to understand function, study structure.