They are meridian lines taking in all forces, men and movements.

Nature, too, saith: "Give and it shall be given unto you." The sun gives heat to the forests, and afterward the burning coal and tree give heat back to the heavens; the arctics give icebergs and frigid streams for cooling the fierce tropics, and the tropics give back the warm Gulf Stream.

The soil in the spring gives its treasures to the growing tree, and in the autumn the tree gives its leaves to make the soil richer and deeper.

Personal also is this principle.

Give thy body food and thy body will give thee mental strength.