Isaiah 8:18

I and the children whom the Lord hath given me Like Hosea, Isaiah had been directed to embody leading ideas of his teaching in the names of at least two of his children, Shear-jashuband Maher-shalal-hash-baz. His own name, also, though not an uncommon one, expresses what we may regard as the most comprehensive idea of his theology "Jehovah saves." He and they are thus for signs and portents (cf. ch. Isaiah 20:3 and see on Isaiah 7:11) in Israel; the children especially cannot be seen or named without recalling to mind prophetic utterances of profound import.

which dwelleth in mount Zion This conception seems to have first emerged in Isaiah's teaching at the time of the Syro-Ephraimite war, when Jerusalem was threatened by a foreign army. We have here perhaps the earliest anticipation of what became afterwards a fixed element of his prophecy the inviolability of Jerusalem, the earthly seat of Jehovah's throne.