I think there are three ingredients in the delicious cake that is a just world.
Foolishness
Wisdom
Courage
The recipe is simple: We need these in equal measure, but add them in the correct order.
Start with foolishness. Dare to dream of what could be, and spend time in that future.
Add an equal measure of wisdom. Recognise your resources and context. Recognise competing future visions. And understand what it will cost to attempt to make the dream a reality.
Drizzle with a healthy amount of courage. A good plan, well executed is better than a perfect plan, never executed. And it takes courage to acknowledge the foolishness, the cost, and to step out into action.
The secret ingredient in this all, is feedback. Serve the cake, and find out how it tastes. Share it with the world. And then make another.
Go bake a cake.