Qouted from "Budo Training in Aikido (Best Karate)" by Morehei Ueshiba.
What use to lean this sword work or that!
Cut off all thought of useless things.
This and that
Sword word you may learn
But for what?
cut off thought [of useless things]
I think Ueshiba's point is that non-aikido sword work cannot be adopted by aikido without significant changes.
The story goes that Ueshiba invited a sword teacher to teach his son (and some others?) sword work. He would just sit in and watch. Afterwards he would pick up a sword and say "Did you notice how the teacher showed this and that? In aikido we would do ..."