Yes, quite comforting.
Morihei Ueshiba quoted directly from the Chinese classics to describe ki and aiki, and his role as a perceived avatar of these forces. It doesn't get much more certain than that.
To address the OP's concerns about the use of "ki" in aikido training, it's not "ki" that's dangerous, but improper instruction (often coming from incomplete understanding) and improper practice of the methods that condition the body to create, balance and apply the complementary forces that generate power. IMO, if a teacher can't demonstrate and explain to you, in clear terms, what he/she is doing and would have you do, and what the purpose and predictable outcomes are, then whatever they are purporting to teach is questionable and the student should beware.