The second is one that I took greatly to heart in my subsequent career. If you want to do broad ambitious things, you need to be accountable to articulate why it is the right thing to do. You need to be able to write down your basic thesis and the evidence behind it and then defend it. In fact, the more power you hold, the more accountable you need to be to open yourself to honest challenge on either facts or logic. This is even more critical in times of rapid change because the facts and consequential logic might change. Accountability and transparency means you are able to reassess your conclusions and react quickly.