“The Art of Peace is to fulfill that which is lacking”. What needs to be fulfilled in Aikido?

John Stevens, in “The Art of Peace“, collects sentences and quotes said and written by Morihei Ueshiba -or simply attributed to O’Sensei. Among the many sentences, one of the most suggestive is precisely the one that gives the title to this post. What does it mean that Aikido consists in “fulfilling that what is lacking”? […]