Things do not change; we change.
The real wisdom here lies in Thoreau's refusal to blame circumstance—he's suggesting that the world's stubbornness is actually our greatest advantage, because it means our discontent points inward rather than outward. Most of us spend energy waiting for our jobs, relationships, or situations to improve, when Thoreau insists the improvement was always available through altered perception and changed habits. A person might spend years resenting a cramped apartment, only to discover (after moving) that their restlessness followed them; Thoreau would say the apartment never needed changing—their approach to solitude, gratitude, or ambition did. It's a humbling thought, because it strips us of the comfort of blaming external conditions while simultaneously offering the liberating knowledge that transformation is entirely within reach.