Why blog? Because it really helps you to write regularly, and forces you to think in different ways, when you have an audience. Even if the audience is small.
Writing helps you reflect on your life and changes you’re making. This is incredibly valuable, as often we do things without realizing why, or what effects these things are having on us.
Writing clarifies your thinking. Thoughts and feelings are nebulous happenings in our mind holes, but writing forces us to crystalize those thoughts and put them in a logical order.