What does Yu Qian's Ode to Coal mean at the end and what thoughts and feelings are expressed?

At the end of the poem "Ode to Coal": May all people be full of warmth and go out of the mountains without any trouble.

I just hope everyone in the world can eat and wear warm clothes. Take pains to get out of the lonely mountain forest. These last two poems can sum up the author's great life of worrying about the country and the people, selflessness, no regrets and courage to sacrifice. Yu Qian completely melted his feelings and wishes into the coal, giving it life and soul.