I write because I know that one day I will die, and thus I should experience as many deliberate observations, careful thoughts, wild ideas, and deep emotions as I can before that day occurs.
When I go back and read my journals or fiction, I am always surprised. I may not remember having those thoughts, but they still exist and I know they are mine, and it's all part of making sense of who I am.
I think it was when I ran into Kerouac and Burroughs - when I was 17 - that I realized I was talking through an empty skull... I wasn't thinking my own thoughts or saying my own thoughts.
I don't think even when you find a person, you can be completely honest, ever. There's still pieces of you that you don't give away. I do believe you always need that place where it's just you, your thoughts, no one else's judgment or anything.
Guard your roving thoughts with a jealous care, for speech is but the dealer of thoughts, and every fool can plainly read in your words what is the hour of your thoughts.
Mostly I make lists for projects. This can be daunting. Breaking something big into its constituent parts will help you organize your thoughts, but it can also force you to confront the depth of your ignorance and the hugeness of the task. That's OK. The project may be the lion, but the list is your whip.
But behavior in the human being is sometimes a defense, a way of concealing motives and thoughts, as language can be a way of hiding your thoughts and preventing communication.