Read the excerpt from anthem. here, on this mountain, i and my sons and my chosen friends shall build our new land and our fort. and it will become as the heart of the earth, lost and hidden at first, but beating, beating louder each day. and word of it will reach every corner of the earth. and the roads of the world will become as veins which will carry the best of the world’s blood to my threshold. and all my brothers, and the councils of my brothers, will hear of it, but they will be impotent against me. the imagery of “the heart” suggests what relationship between the society the narrator plans to build on the mountain and the outside world?

The imagery of "the heart" suggests a relationship of leadership and trust between the society the narrator plans to build and the outside world. It shows when says: "It (the new land or fort) will become as the heart of the earth, lost and hidden at first, but beating louder each day".

The narrator is talking about a place that will be (in the future) the main organ of the outside. Everybody is going to hear of this place and will feel attracted to it, and the brothers and their Councils will be impotent if they try to destroy it because of its effectiveness and central power.

Everything is going to depend on this place.  

d. promised it other land