'Inaccessible' in the Bible

From Aroer, which [is] on the edge of the wadi of Arnon and the city that [was] in the wadi on up to Gilead, [there] was not a city that was inaccessible to us; Yahweh our God gave {everything} {to us}.

'Call to me, and I will answer you, and I will tell you great [things] and inaccessible [things that] you have not known.'