Stuff like this is always subjective. What one sees as truth may not be the same for others. The author grouped them under categories but some are good for all. Here are my favorites:
6. What new things am I learning?
8. How meaningful is my work?
21. How can I help one person today?
The whole thing @ The 21 Most Important Questions Of Your Life - Darius Foroux - Pocket
6. What new things am I learning?
8. How meaningful is my work?
21. How can I help one person today?
The whole thing @ The 21 Most Important Questions Of Your Life - Darius Foroux - Pocket