“Hence that general is skilful in attack whose opponent does not know what to defend; and he is skilful in defense whose opponent does not know what to attack.”

“they all know the skill of the skilful, and in doing this they have (the idea of) what the want of skill is.”

“In Aikido we never attack. An attack is proof that one is out of control. Never run away from any kind of challenge, but do not try to suppress or control an opponent unnaturally. Let attackers come any way they like and then blend with them. Never chase after opponents. Redirect each attack and get firmly behind it.”

“Attack is the secret of defense; defense is the planning of an attack.”

“Know yourself better than your opponent knows you, know your opponent better than he knows himself, know yourself better than you know your opponent, and know you have all this knowledge and you will be victorious. That’s the advice I’ll give my clone before I defeat him in battle.”

“A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it.”