Why do u need to write?

Recently, I have attended a short course organized by UTeM to encourage their staffs to write books. I've gained valuable knowledge from that course in which it has inspired me to get back active in blogging. One of the trainer says that we need to write anything without bothering the grammar mistakes or any other type of mistakes. Why? Because mistakes can always be corrected but the mood of writing comes once a while. This is why most of the PhD candidates always stuck at writing thesis. It can drag you for years sometimes because of the unarchived mood. So, one way to train you to write is through blogging. In your own blog, who dares to question about your personal life (if you are writing about personal life) except if you are writing about controversial issues. So, my friends outside there, let's write. For those who are going to teach the same subject as me, lets write a book :)