In the book code talker how does Ned know how girls and boys feel in the story

Are you referring to chapter 2 when Ned attends the new school?

It was not always easy for me to understand what those other boys and girls were saying. Even though we all spoke in Navajo, we had come from many distant parts of Dinetah. In those days, our language was not spoken the same everywhere by every group of Navajos. But, despite the fact that some of those other children spoke our sacred language differently, what we were doing made me feel happier and more peaceful. We were doing things as our elders had taught us. We were putting ourselves in balance.