I think the quote from the book I read on Headway says more than enough, meaning that I don't really need to put any additional words to the essence. What is it about?
You don't need a lot of money, but you need discipline, and you need to save and set aside money to do good investments. That is what you need, and then you will have the chance to become rich.
What do you need? You need to invest in good things, and to keep the discipline. If you only set aside money that is accidentally left over by the end of the month, you will not succeed. It need to be at the top of your priority list.
And, you must keep it in as long as you can, because if you start taking profit too early, it will stop the chance of actually living from the profits sometime in the future.
What is a good investment? Where should you invest? That is something I will not deal with here, and honestly, I am still trying to grow in wisdom on this topic myself!