A minimum mission is a perspective to help build security.
A mission requires work. We are willing to do this work because we need to make a living in order to pay the bills.
Your minimum mission is the minimum amount of work you need to do in order to live your lifestyle. Once we know our minimum mission and that we know we can fulfill our minimum mission regardless of what happens we have security.
Once we have our minimum mission working we can focus on two things.
The first focus is replacing work with other work that brings us happiness and fulfillment. The more happiness and fulfillment we get from work the more our life as a whole is fulfilling.
The second focus is saving so that our minimum mission can be covered by investments rather than work.
Both of these focuses can be expanded. As they expand the more security we have and the more fulfillment and happiness we have.