Power and heart (that is, courage) are spoken of as if they were people whom someone could wake up in order to make them act. Alternate translation: "He will make himself powerful and will become courageous" (See: [[rc://en/ta/man/translate/figs-personification]])
Not standing represents being defeated. Alternate translation: "the king of the South will be defeated" or "his army will be defeated" (See: [[rc://en/ta/man/translate/figs-metaphor]])