H. P. Grice: Enough Of A Strong Rationalist To Want To Play With "Ratio Essendi"

"I can regard myself, qua rational being, as called upon not merely to have reasons for a belief of mine (ratio cognoscendi) and also for other psychological states attitudes, like a desire or an intention, but to allow, and to search for, a reason for a thing to be the case, at least in that area of reality which is constructed)."

"Such a reason will be a ratio essendi."