I saw two short quotes yesterday. Not at the same time, but they fit well together. Life is short. Live your dreams.
Being a writer has been a dream for a long time, and I'm sure not just for me. But to live your dream you have to do more than just think about it. To make it reality you have to work at it.
Yes, we need to spend time doing the soft work, which is my way of describing the thinking time. That's important. But if you don't sit down and put pen to paper, or fingers to the keyboard, then the dream can't become reality. It will just be a dream.
No one can read the book in your head.