He sent for the colt with the obvious intention of stimulating the people to just such a demonstration as followed.
As to the particulars, we need only note that the most obvious explanation of His knowledge of the circumstances that the messengers would encounter, is that it was supernatural. Only one other explanation is possible; namely, that the owners of the animal were secret disciples, with whom our Lord had arranged to send for it, and had settled a sign and countersign, by which they would know His messengers. But that is a less natural explanation.
Note the remarkable blending of dignity and poverty in' The Lord hath need of him.' It asserts sovereign authority and absolute rights, and it confesses need and penury. He is a King, but He has to borrow even a colt to make His triumphal entry on. Though He was rich, for our sakes He became poor.
Jesus then deliberately brought about His public entry. He thereby acts in a way perfectly unlike His whole previous course. And He stirs up popular feelings at a time when they were specially excitable by reason of the approaching Passover and its crowds. Formerly He had avoided the danger which He now seems to court, and had gone up to the feast as it were in secret.' But it was fitting that once, for the last time, He should assert before the gathered Israel that He was their King, and should make a last appeal. Formerly He had sought to avoid attracting the attention of the rulers; now He knows that the end is near, and deliberately makes Himself conspicuous, though--or we might say because--He knew that thereby He precipitated His death.
The nature of His dominion is as plainly taught by the humble pomp as is its reality. A pauper King, who makes His public entrance into His city mounted on a borrowed ass, with His followers' clothes for a saddle, attended by a shouting crowd of poor peasants, who for weapons or banners had but the branches plucked from other people's trees, was a new kind of king.
We do not need Matthew's quotation of the prophet's vision of the meek King coming to Zion on an ass, to understand the contrast of this kingdom with such a dominion as that of Rome, or of such princes as the Herods. Gentleness and peace, a sway that rests not on force nor wealth, are shadowed in that rustic procession and the pathetic poverty of its leader, throned on a borrowed colt, and attended, not by warriors or dignitaries, but by poor men unarmed, and saluted, not with the blare of trumpets, but with the shouts of joyful, though, alas! fickle hearts.