In Randori we teach the pupil to act on the fundamental principles of Judo, no matter how physically inferior his opponent may seem to him, and even if by sheer strength he can easily overcome him; because if he acts contrary to principle his opponent will never be convinced of defeat, no matter what brute strength he may have used.
"Judo: The Japanese Art of Self Defense", as translated in A Complete Guide to Judo : It's Story and Practice (1958) by Robert W. Smith
If there is effort, there is always accomplishment.Jigoro Kano
There are people who are excitable by nature and allow themselves to become angry for the most trivial of reasons. Judo can help such people learn to control themselves. Through training, they quickly realize that anger is a waste of energy, that it has only negative effects on the self and others.Jigoro Kano
To ask may be but a moment's shame, not to ask and remain ignorant is a lifelong shame.Jigoro Kano