Ajahn kavali biography of mahatma

Ajahn Chah sometimes talked about his eccentric teacher, Ajahn Tongrat. It's quite probable that Ajahn Chah's unique style of teaching owed much to his time with Ajahn Tongrat.

There were many similar occasions in which monks or novices, told to do something against the Vinaya but who then did them without any knowledge, created an occasion for getting a lesson they would never forget – that is, a long, stinging and fiery talk – because they saw him as their teacher but they didn’t give priority to Dhamma and Vinaya.
From Ajahn Chah’s experiences with Luang Pu Tongrat, he saw that if a person was not very clever and astute, they couldn’t learn any Dhamma from him.

That is, they would try to emulate him, not trying to learn from his example. For instance, the way Luang Pu spoke would often not be very composed, when walking on alms round he would continually be asking for things, and when he was fierce with the monks