Can Dhamma Be Understood By A Person With No Higher Education?

There was no Phd’s in Buddha’s time. So, I am guessing there is something else that supercedes higher education to understand the Dhamma. And, higher education might not be necessary at all.

There was a monk who couldn’t memorize one paragraph of the teaching, by the end of the paragraph, he forgot the first.

His arahant brother gave up on him. The Buddha gave him a white cloth and just wipe to clean and say clean or impermanent or something.

He attained to enlightenment seeing that the white cloth becomes dirty and thus is impermanent.