That ye may look upon it, and remember all the commandments. It was indeed a minute and apparently trivial distinction, and yet such an one as would most surely strike the eye, and through the eye the mind.
It was like the facings on a uniform which recall the fame and exploits of a famous regiment. The tasseled Hebrew was a marked man in other eyes, and in his own; he could not pass himself off as one of the heathen; he was perpetually reminded of the special relation in which he stood to the Lord, whose livery (so to speak)—or, to use another simile, whose colours—he wore.
No doubt the sky-blue string or thread which was so prominent was meant to remind him of heaven, and of the God of heaven. And that ye seek not after your own heart and your own eyes, after which ye use to go a whoring.
The office of the tassels was to promote a recollected spirit. As it was, their fickle minds were always ready to stray away towards any heathen follies which their restless eyes might light upon. The trivial but striking peculiarity of their dress should recall them to the thought that they were a peculiar people, holy to the Lord.