the rod of thy strength - the rod of correction (Isa 9:4; Isa 10:15; Jer 48:12), by which Thy strength will be known. This is His Word of truth (Isa 2:3; Isa 11:4), converting some and confounding others (compare 2Th 2:8).
out of Zion - or, the Church, in which God dwells by His Spirit, as once by a visible symbol in the tabernacle on Zion (compare Psa 2:6).
rule thou, etc. - over enemies now conquered.
in the midst - once set upon, as by ferocious beasts (Psa 22:16), now humbly, though reluctantly, confessed as Lord (Phi 2:10, Phi 2:11).