By understanding and harnessing the forces that drive human behavior, you can create a self-sustaining philanthropic effort that reaches millions of people. It begins with an entrepreneurial attitude: take an idea and execute on that idea. If it doesn't work, learn why and build on what you've learned.

Meaning: Another worker can often find something to improve in work already considered finished. The second barber’s remaining task suggests that completion depends on standards and perspective, without proving that earlier work was careless or endless correction is necessary.

Meaning: Let the person best suited to the immediate task take the lead. The dog and obstacle image values relevant capability, without making one success a permanent rank or denying others the chance to learn and contribute.

Meaning: Your own mistakes can teach caution, but another person’s experience may offer the same lesson without the same cost. Listen for relevant lessons before repeating an avoidable error.