"As your Bujutsu [Martial Technique] training approaches perfection you will be able to detect the suki [opening/weakness in your enemy's technique], even before he can, and as if to satisfy some deficiency in him, you can fill the suki with your technique. (p. 26)"
January 1, 1970
https://en.wikiquote.org/wiki/Morihei_Ueshiba