Chapter 1 treats human life as something received before it is interpreted. Because we do not choose our birth, fully master our span, or cancel our death, the meaning of life cannot be built from private autonomy alone.
The chapter then frames earthly existence as a preparation course for the eternal world. That makes ordinary life weighty rather than disposable. Time is short, but shortness increases urgency instead of removing responsibility.
Its strongest practical pressure is directional. A person needs an origin, a purpose, and a destination that can function like a compass. Without that, even sincere effort becomes wandering.