With an interest rate of 5%, your financial independence will cost the sum of all of your recurring costs multiplied by a factor of 20. Do you want to drink a coke every day ? That's about 0.50$us/can multiplied by 365 multiplied again by 20, for a total of 3650$us. Save 3650$us and put it in something that pays 5% (bank CD, corporate bond, etc ..) and you can drink a coke every day for the rest of your life without ever having to work to pay for it. You can just sit out on the beach somewhere and drink your coke.
Want to stay in a marina one day a week at 50$us/night ? That's 50$us multiplied by 52 multiplied by 20, or 52k$us that you have to save in order to pay for that one night a week for the rest of your life without having to ever work again.
Thinking like that really puts that 40$us/month cell phone bill into perspective, that's 40$us times 12 times 20, or 9600$us to have cellular service for the rest of your life.
There are people who live in poor countries who cook their own food, etc, take a machete out into the field every day and work hard, and who live on a few hundred $us/year. They have trouble understanding why anyone in the United States isn't financially independent, because the 20k$us one of us might spend on a new car would be enough to keep an entire family at their present living standard for the rest of their life without any of them ever having to work again. 20k$us times 0.05 divided by 365 equals 2.74$us/day. If you can manage to live on 2.74$us/day all it takes is 20k$us to never have to work again, can you find a way to live on 2.74$us/day ? Much of the world lives on less than that.
I second Vega1860's recommendation, Annie Hill's book is very instructive.
What's your freedom worth to you ?