Probably the fact I wasn't speaking or uttering anything at all.
Because epistemologically it is a self-defeating question. It's what philosopher Roderick Chisholm called "the problem of criterion." I am not obligated to keep on giving justifications for my beliefs (which in turn will force me to give justifications for my justifications, and on to infinity).
If I am to know how I know something, I must have both an object of knowledge (p, word of wisdom in this case) and a criterion to validate p (we will call q.). I must also have something else: r, the fact that p satisfies q.
But this raises a problem. One can now ask “How do you know q and r?” What justifies my choosing this as a criterion? I must now satisfy the conditions with q’ and r’. But that isn’t good enough. How do I know q’ and r’? I must now satisfy those new conditions with q” and r”.
But to point towards an answer: I had asked God a question and immediately, before I had a chance to reflect on anything, a distinct proposition was in my head. The proposition glorified God, attacked Satan’s kingdom, and furthered my trust in Jesus. If that isn’t a sufficient criterion, nothing is.