For some people, abundance is having as much resources as you can so they will be available when you need them.
Alternatively, abundance is having the resources you need as you need them.
The first version describes western civilization today, where it is normal to claim as much resources/money as you can. In a finite resourced world, abundance for some translates into scarcity for most people.
The second version is practiced in many indigenous communities, by hunter-gatherer communities of antiquity, and by most of us when we share a meal with our family and friends. In a finite resourced world, abundance for some translates into abundance for all.
Our Earth provides an abundance of resources, use what you need and leave the remainder for the rest of us.