I'd say “I think” if I only have poor knowledge of the facts, have to heavily rely on my priors and my intuition, and hence I could easily shift my probability assignment (and narrow what E.T. Jaynes calls my Ap distribution) by (e.g.) looking stuff up, if I could be bothered to. I'd omit it if I already had as much relevant information as I could reasonably gather, and so I don't expect my probability assignment to shift or my Ap distribution to narrow in the near future.