Numbers 15:40

That ye may remember They were not to mistake the wearing of these fringes or borderings, as if they had real sanctity or religion in themselves, but to consider them as helps to their memories, and means of awakening them to a sense of their special relation to God, as the only object of their worship, their Governor and Judge. But although this, and many other memorial signs among the Jews, seem to have been admirably fitted to keep up in their minds the remembrance of their duty, and one would have imagined that, with such helps, they could scarce ever have omitted the practice of it; yet their example proves to us that all methods are insufficient to affect thoroughly the hearts of men, till God, according to his promise, to be fulfilled especially under the New Testament dispensation, write his laws on their hearts by his Holy Spirit, Jeremiah 31:31, and Ezekiel 36:26. This we should look for, and seek with all our hearts. When this is obtained, and not before, we shall be holy unto God, as Israel were here exhorted to be, that is, purged from sin, and sincerely devoted to God in soul and body.