This book is not in any way about how to be happy or how to be popular. There are a lot of books on the shelves which talk about that, already.
This book is about how to be successful, but not in the conventional sense most people use the word. What this book really brings to the fore is how to be human, and how to live with the consciousness that your life is worth more than a caterpillar's (and nothing compared to it), which only lives for a moment and then disappears. Again, it is about knowing that at the end, you have lived your life to the full as humans ought to; that you have not wasted your career and life, and lastly, that the world would be different because you passed through it.