This book provides the insight behind the growth of Google as we have seen. The primary idea is to hire the most intelligent people and provide them with exceptional environment where they will challenge to solve problems in novel ways.
A summary is here: https://docs.google.com/document/d/1nj-M-caLlOXbkwZW9FIz7guOr-jr2YX5Jn3c4o_y-eM/preview