Aikido Journal Issue 106
From an interview with Seishiro Endo
Seishiro Endo wrote:
I remember one time when O-Sensei was standing there explaining something and he told me to try pushing his knees from the side. I was amazed at how soft they were. But they were soft in such a way that they seemed to defy pushing altogether, like if I tried to push further I would fall into some sort of void.