The centre of the cross upon which the feet of the Aikido practitioner move is the Centre of the World, the point where all oppositions are reconciled and resolved. The Centre of the World is not in any given geographical location; it is wherever balance is achieved, and at all times.
‘Concentrate force in the fingertips of the left hand to project the opponent’s right hand upwards towards his shoulder’ - O Sensei (Budō)
"When the opponent's sword rises, you must clearly imagine within yourself the line (direction) that will guide the momentum of your attack – straight or diagonal, according to your choice." Morihei Ueshiba - Budō
Tenchi, kokyu, kaiten, kaeshi, and shiho are technical principles present in every Aikido technique. Every Aikido technique must respect all of them in order for the unique principle of irimi in Aikido to be a reality.
In order to throw uchi tachi, uke tachi must first make him lighter, make him float on his supports.
四法ヲ應用ス O Sensei - “Budō”- The fourth law of Aikido is expressed by two complementary techniques: yonkyo and tenchi nage.
