He looseth the bond of kings - The bond of kings (מוּסר mûsâr) here means that by which they bind others. Their power over others he loosens or takes away.
And girdeth their loins with a girdle - That is, he girds them with a rope or cord, and leads them away as prisoners. The whole series of remarks here refers to the reverses and changes in the conditions of life. The meaning here is, that the bonds of authority which they imposed on others are unbound, and that their own loins are bound with a girdle, not a girdle of royal dignity and ornament, but such a one as they are bound with who are servants, or who travel. "Pict. Bib."

He looseth the bond of kings - He takes away their splendid robes, and clothes them with sackcloth; or, he dissolves their authority, permits their subjects to rebel and overthrow the state, to bind them as captives, and despoil them of all power, authority, and liberty. Many proofs of this occur in the Israelitish history and in the history of the principal nations of the earth, and not a few in the history of Britain.

(i) He looseth (k) the bond of kings, and girdeth their loins with a girdle.
(i) He takes wisdom from them.
(k) He abates the humour of princes, and brings them into the subjection of others.

He looseth the bonds of kings,.... Not with which they themselves may be bound, being taken prisoners, or being so before made kings, and brought from thence to reign, as in Ecclesiastes 4:14; but that which they bind on their subjects, a yoke of bondage, tyranny, and oppression; so that to loose their bond is to loose their subjects from it, and free them from their arbitrary and despotic power, and from the burdens they lay upon them: unless rather it should be understood of loosing their waistbands, as an emblem of their government, ungirding them, or unkinging them, stripping them of their royal power and authority, called a "loosing of their loins", Isaiah 45:1; and this power God has over such great personages, as to set up kings, and remove them at his pleasure, Daniel 2:21; which shows that strength and power, as well as wisdom, are with him; this may respect Chedorlaomer casting off the yoke of Nimrod, and the kings of Canaan casting off the yoke of Chedorlaomer, and being loosed from it, Genesis 14:1;
and girdeth their loins with a girdle; not with a royal waistband, as an ensign of government; see Isaiah 11:5; which he looses, and strips them of, but another instead of that; he girds them with the girdle of a servant or traveller; the allusion being to the custom in those eastern countries, where they wore long garments, for servants to gird them up, when they waited on their masters, or when men went long journeys, see Luke 17:7; and so may signify that kings sometimes become servants, or go into captivity, and there be used as such, as they sometimes are; the Vulgate Latin version is, "he girds their reins with a rope".

He looseth the bond of kings--He looseth the authority of kings--the "bond" with which they bind their subjects (Isaiah 45:1; Genesis 14:4; Daniel 2:21).
a girdle--the cord, with which they are bound as captives, instead of the royal "girdle" they once wore (Isaiah 22:21), and the bond they once bound others with. So "gird"--put on one the bonds of a prisoner instead of the ordinary girdle (John 21:18).

Looseth - He freeth them from that wherewith they bind their subjects to obedience, their power and authority, and that majesty which God stamps upon kings, to keep their people in awe. Girdeth - He reduces them to a mean and servile condition; which is thus expressed, because servants did use to gird up their garments (that after the manner of those parts were loose and long) that they might be fitter for attendance upon their masters: he not only deposes them from their thrones, but brings them into slavery.