IMHO, the principles of Aikido (connection and nonviolent conflict resolution) are content and context free.
You can apply them strictly to the physical practice on the mat or you can incorporate and integrate them into other contexts such as spiritual growth.
From what I understand, that was O'Sensei's intent.
I second that of Mary. Thank you very much Lynn Seiser sensei for sharing that.
Of all the books that I read about Aikido, one of them is my main favorite. "Enlightenment through Aikido" by Kanshu Sunadomari shihan of Manseikan Aikido. I find the book to be more closer to what O'sensei really want about Aikido, IMHO.
Domo Arigato Gozaimashita.