“Surely you can change your world if you work at it. (…) a world of which you are the only source and ground is fully within your power to change. What is created can always be dissolved and re-created. All will happen as you want it, provided you really want it. (…)”

Source: The Butterfly Effect: How Your Life Matters

Kosmos interview on grief, Dark Optimism, aliveness and activism (2014) http://www.darkoptimism.org/2014/12/21/dark-optimism-power-of-grief/#post-4075

As quoted in Back on Track : How to Straighten Out Your Life When It Throws You a Curve (1997) by Deborah Norville, p. 201
Variant: Change your thoughts and you change your world.

Entering the Castle : An Inner Path to God and Your Soul (2007), p. 85

Teen People Video Short, 20 Teens Who Will Change the World, 2003

The Last Lecture (2008)
Variant: You can always change your plan, but only if you have one.."

University of Texas at Austin 2014 Commencement Address https://www.youtube.com/watch?v=pxBQLFLei70
Context: If you want to change the world, start off by making your bed... If you make your bed every morning, you will have accomplished the first task of the day. It will give you a small sense of pride, and it will encourage you to do another task and another and another. And by the end of the day, that one task completed, will have turned into many tasks completed. Making your bed will also reinforce the fact that the little things in life matter. If you can't do the little things right, you'll never be able to do the big things right. And if by chance you have a miserable day, you will come home to a bed that is made, that you made. And a made bed gives you encouragement that tomorrow will be better.