I use to be able to recite that from memory when I was younger. He had a whole litany of great quotes -
What has mood to do with it? You fight when the necessity arisesno matter the mood. Mood’s a thing for cattle or making love or playing the baliset.”
“If wishes were fishes we’d all cast nets.”
Frank Herbert was a great author, I would love to have heard his opinion on what we are facing now.
The hardest thing in the world is to assume the mood of a warrior, he said. It is of no use to be sad and complain and feel justified in doing so, believing that someone is always doing something to us. Nobody is doing anything to anybody, much less to a warrior. You are here, with me, because you want to be here. You should have assumed full responsibility by now, so the idea that you are at the mercy of the wind would be inadmissible. ― Carlos Castaneda, Journey To Ixtlan
Or Robert Heinlein, another who very well understood.