In an argument, you may ...

In an argument, you may silence your opponent by pressing an advantage of strength or of wealth, or of education. But you do not really convince him. Though he is no longer saying anything, in his heart he still keeps to his opinion, the only way to make him change that opinion is to speak quietly and reasonably. When he understands that you are not trying to defeat him, but only to find the truth, he will listen to you and perhaps accept what you tell him.
 Kano Jigoro

Quotes from the same author

Judo is the way to the most effective use of both physical and spiritual strength. By training you in attacks and defenses it refines your body and your soul and helps you make the spiritual essence of Judo a part of your very being. In this way you are able to perfect yourself and contribute something of value to the world. This is the final goal of Judo discipline.
 Kano Jigoro
If there is effort, there is always accomplishment.
 Kano Jigoro
Judo teaches us to look for the best possible course of action, whatever the individual circumstances.
 Kano Jigoro
Walk a single path, becoming neither cocky with victory nor broken with defeat, without forgetting caution when all is quiet or becoming frightened when danger threatens.
 Kano Jigoro