What does mutual reciprocity mean?

We want to see all happy, all living out their lives here in harmonious contentment and progressing steadily onward to fit themselves for an endless hereafter. Much may be done by each one in this great work, both for himself and others. None are so pure, so good, they may not receive help and benefit on their journey, and few are so low and debased they cannot do some kind deed, some good, however trifling, to their fellow creatures. Mutual dependence and mutual reciprocity in kind actions, extending through all branches and degrees of society will tend more to harmonise and equalise the condition of the whole.

―Joshua, son of Nun in Spirit