Saito on Ukemi

"There are often those who fancy themselves great by virtually knocking their partners downflat on the mat. Their concept of hard training is utterly wrong. The essence of real training lies in the throwing process. When let loose mercilessly, Aikido techniques do not allow Ukemi. It therefore behoovesyou to throw your partner in such a manner that he can respond with Ukemi without fear of injury. The purpose of Aikido training is to build up strength, not to inflict injury".

- Saito Morihiro , Traditional Aikido, Vol. 5