The resources needed to satisfy all the want of human being are said not to be enough compared to all the want of humans we have many want we would like to satisfy at any given point in time which we may not be able to meet up with due to economic problems scales of preference simple is setting our needs inorder of priority.
I would suggest that you read Think and grow rich by Napoleon Hill or The Science of Getting Rich. There is an unlimited resource. All begins in man's mind.
If every nation does a scale of preference ranking the needs and wants, prioritizing the necessities and which are not then every people will wrestle because every government or authority will take the power to distribute the needs and resources. Though resources are limited to the planet, ideas aren't. Scarcity is true, but there would be another or new way of thinking to overcome that.
Not to get too far to the opt of OP, economic problems just require economic solutions. There is no lack of resource, only lack of ideas.
I do not think that this saying is correct. When our requirements were primitive, man discovered wood, which was burned to obtain fire and the beginning of energy. After the needs increased, coal appeared, including steam locomotives and internal combustion engines. Then oil appeared and the aviation industry developed. Therefore, when human needs increase, resources develop in return. necessary to cover these needs.
I remember 100 years ago, people did not know about oil, and even when it appeared, they were not aware of this wealth, so the next wealth may be close or even outside the planet.

To be exact, there is more exploration outside the planet than what is inside the core. Which means just imagine what else can we discover. I just wish it is not another virus.