Peter A Goldsbury
Ueshiba did not give any further explanation and left it to the students to grasp what he meant. The point is that he was probably familiar with the whole breadth and depth of the concept, but his students did not share this familiarity.
There are also accounts of students basically politely ignoring the "crazy old man," either because they couldn't understand him or because they wanted to skip the philosophy and get back to bashing each other around. Or both. So even among his direct students, it's not a given that they were interested in pursuing what was being offered.