When you read, you get the benefit of plumbing the depths of another’s mind. When you write, you get the benefit of plumbing your own. Therein lies the great benefit to writing. The task is an exercise in self-discovery. It's an exploration into who you are, and what you believe.
We all know reading should be a lifelong pursuit. In the same way, writing, too, should be a lifelong endeavor. They are both strategies for growth. You need both in your life.
Start journaling. Start blogging. Start writing a short story. Start writing poetry. Begin writing now. Start and never look back.