The "evidence, outside of myself," is the way I (a sinner) try to live my life.
I'm not all that concerned about "what I don't know" (though I continue to seek) because I recognize that all is in God's hands (so to speak). He knows; His knowledge is Absolute; and His Will eternally prevails "on earth as it is in heaven." My job here on earth is to understand His Will to the (limited) extent I can, and do it — for love of Him and His Logos, His Truth, by His Grace....
I do see the worrisome problem of the thing that one thinks is "right" might actually turn out to be "wrong." But since God is the touchstone, the criterion of Truth, it seems the closer one is to Him, the better one knows what the "right" is.
Just some thoughts....
So, do you admit what you hold as true could be wrong, too?