"The Art of Peace has no form - it is the study of the spirit." - Morihei Ueshiba
Just a couple of thought, he didn't really say "Art of Peace", he said "Aikido", John was being a littlle poetic here. Also, the word "spirit" here isn't that simple, it gets into some deep areas that don't make sense unless they are in context with a number of other things he talked about, and might not be quite what most people would expect on a simple reading. I'll get into that at some point.