Write what's on your mind

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Why the fuck is it "write what's on your mind?"
Why isn't it "in your mind" or even "from your mind"?
The preposition "on" implies that the "what" is a separate entity from the "mind" and which only bears a relationship of position.

Nigga, how could I possibly write something that wasn't in my mind at the moment?

I don't want anyone to be bullied ever again.

Acne is destroying my forehead. Doctors don't know what to do. It feels bad but it isn't real illness at least. I still can't get it out of my mind. Maybe literature is going to help me with this one. The Magic Mountainhas been a great book so far.

I should start doing drugs. It seems like this Chinese cartoon was meant to be watched whil high.

I drank about 7 beers too much and crashed my car into some barriers.. I left it on the freeway in the dark. The cops told me that I was found vomiting on the freeway gravel. It could have turned out worse but no the less my life is ruined for the foreseeable future. There's no love anymore, all are alienated. Lost all my friends from school when I had to drop out to spend time in jail. I'm in massive debt with no car. My parents consider me to be a burden and dislike me. There is nothing redeemable about my personality. I can feel the stiffness of death eating my inner senses.
>What do /lit?

These replies have reminded me how pretentious Veeky Forums can be.

Veeky Forums would be a lot better if they made a way to write posts somewhere besides this stupid little box that makes it impossible to proofread. i suppose they think it limits the response length and so helps the platform be more addictive like twitter, low thought high impulse responses keep users hooked, but come on, this fucking sucks. and don't tell me about some russian spyware chrome plugin that makes editing bearable at the cost of all the info in your contacts and calendar info being sent to st. petersburg.

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