When did Mr. M decided to be a teacher?

Mr. M realized he wanted to be a teacher during a visit to Wapadsberg Pass, where while looking as a young boy, he was stood in awe of its beauty. His teacher had described the rivers, landforms, and people that he's meet if he journeyed across the continent from South to North. It was at this moment that Mr. M comprehended both the power of knowledge and the vast beauty of his country, and the valuable contribution he could make as a teacher.