By clearly writing your ideas whether in a blog or a book, it greatly helps you to understand your own ideas and philosophies and benefit other people. Most people open their mouths to sell their services. What they initially achieve is high disengagement rates. It is better to tell the world who you truly are and what you believe. If people resonate with your message, they will buy your services. Do not attempt to sell, strive to educate. If you do so, the transactional followers become likeminded supporters. The difference is huge for you and them.