Favorite droll turn on cogito ergo sum*: I think therefore I think I am. Possibly better: I think therefore I think I am thinking.
You are your epistemology. (Gregory Bateson)
I’ve always stuck with John Lilly’s:
My beliefs are unbelievable.
In this context, why not: “My thoughts are unthinkable.”
* But I have convinced myself that there is absolutely nothing in the world, no sky, no earth, no minds, no bodies. Does it now follow that I too do not exist? No. If I convinced myself of something [or thought anything at all] then I certainly existed. But there is a deceiver of supreme power and cunning who is deliberately and constantly deceiving me. In that case I too undoubtedly exist, if he is deceiving me; and let him deceive me as much as he can, he will never bring it about that I am nothing so long as I think that I am something. So, after considering everything very thoroughly, I must finally conclude that the proposition, I am, I exist, is necessarily true whenever it is put forward by me or conceived in my mind. (Rene Descarte)