"Get every single detail perfect and limit the number of details". Priceless.
I am a big fan of Jack Dorsey. He is a visionary and a great leader. He has what it takes to create discontinuities in the market. Little wonder that he is compared to Steve Jobs (that is unfair to both of them, is my opinion). Little wonder that developers and designers want to work with him. And if you want to know more about him, check this and this.