Adam Clarke on Deuteronomy 12:14

The place which the Lord shall choose - To prevent idolatry and bring about a perfect uniformity in the Divine worship, which at that time was essentially necessary; because every rite and ceremony had a determinate meaning, and pointed out the good things which were to come, therefore one place must be established where those rites and ceremonies should be carefully and punctually observed. Had it not been so, every man would have formed his worship according to his own mind, and the whole beauty and importance of the grand representative system would have been destroyed, and the Messiah and the glories of his kingdom could not have been seen through the medium of the Jewish ritual. For uniformity in every part of the Divine worship the same necessity does not now exist; because that which was typified is come, and the shadows have all fled away. Yet, when it can be obtained, how desirable is it that all sincere Christians should with one mouth, as well as with one heart, glorify their common Lord and Savior!