"endless resources" is a correct phrase and can be used in written English.
It means an unlimited amount or supply of something. Example: The company's success was attributed to its endless resources of innovative ideas and skilled employees.
"One thing you have on your side, Miss Caitlyn, is endless resources," she said one day.
They have watched over this historic property, providing endless resources to ensure that it is maintained in its original splendor.
To name just two: the oil industry has endless resources and they're scared about re-election losses.
"There seemed to be endless resources of money flowing around, and municipalities had relatively easy access to loans".
His team is still the most heavily funded, with top-of-the-line equipment and seemingly endless resources.
Prince, an artist of seemingly endless resources — both musical and material — poses a slippery challenge to any would-be cover band, even one with purely imitative aims.
Large scale retrofitting of meters would herald a radical change in our relationship with water, meaning it would no longer be considered an endless resource.
Metaphorically they are the terminus of an idea: that the ocean is an endless resource where new fish can always be found.
Homework takes a lot of willpower, particularly when it comes to the most detested or boring assignments, and willpower is not an endless resource.
Michael Ondaatje's The English Patient is an obvious reference point, and the desert serves as an endless resource for metaphorical elaboration: "They drive across an acreage of red serir dotted with gazelle bones.
"It's a beautiful, endless resource to do many more analyses," De Laat says.
