What evidence from "Cranes" explains Tok-chae's motivation for remaining at home once the South invaded, despite the danger?

The structure of the poem says “my soul has grown deep like the rivers” like the bottom of a river he has grown for power, the language of the poem tells David to dig “deep,” meaning to grow for power to handle life. the theme of the poem is life-giving, because of the strength his soul has been given to fight off all life problems.