That's right. So if you buy the idea that you're going to be a different person in the future than you are today, perhaps the important question to ask is, what are things about ourselves today that perhaps we might wish to see changed? Are there elements to our personality, to our being short-tempered or impatient or unempathetic? Are there things about ourselves that we would like to change? And one of the questions then becomes, if you allow for the fact that you're going to become a different person, how do you help construct that person that you're going to become? And I think I like that idea very much because it suggests that we can be the authors of our future self, that we can actually construct this person we're going to become. The engine to do this is curiosity, which is that if we only are doing the things that we're used to doing, if we're only talking to the people who are already in us, in our circle of friends and family, we're never going to expand our horizons to imagine the people we might become. The second piece of advice that I had is to exercise humility, especially when it comes to expressing our opinions on various things. You know, social media platforms have become vehicles for grandstanding and accusation and malevolence sometimes. And so much of that, I think, is based on a false certitude that the way I think today is going to be the way that I think tomorrow. And if we had a little bit more humility, if we actually said, I think the way I think today because my circumstances, my environment... some ways has conspired to shape who I am today in powerful ways, my environment is going to shape me to be a different person tomorrow. I might have very different views one month from now, one year from now, or 10 years from now. I've given you a number of ways in which our future cells are going to be weaker and frailer than we are today. And that is true. That is part of the story. But our future selves are also going to have capacities and strengths and wisdom that we do not possess today. So when we confront opportunities and we hesitate, when I tell myself, I don't think I have it in me to quit my job and start my own company, or I tell myself, I don't have it in me to learn a musical instrument at the age of 52, or I tell myself, I don't have it in me to look after a disabled child. What we really should be saying is, I don't have the capacity to do those things today. That doesn't mean I won't have the capacity to do those things tomorrow. So lesson number three is to be brave.