Suppose a school was founded in a remote mountain valley centuries ago by the first representative of a now-prominent deity. This valley has a forest with a river flowing through it; there are no major settlements nearby at the time of its founding.
Rather than teaching arithmetic and language skills, this educational institution provides instruction in fields such as advanced/obscure magic; military tactics; martial skills, such as swordsmanship and wrestling; politics; animal husbandry; and survival. Essentially, this institution trains heroes.
Instruction is performed in a master-apprentice-style relationship. Each instructor has one to three students at a time and spends a considerable amount of time working one-on-one with each of them.
The intent of this institution's mountain location was to make it independent of the money and politics of the surrounding country. However, resources are significantly harder to acquire and maintain as a result.
What steps should the institution take to ensure its continuing economic and political independence without moving from its founding location?
Answers identifying why this continuing independence is impossible are also welcome.