Adam Clarke on Romans 10:15

How beautiful are the feet of them that preach - Dr. Taylor remarks on this quotation, which is taken from Isa 52:7, that "feet are variously used in Scripture, and sometimes have respect to things internal and spiritual. For as the life of man and the practice of piety are compared to walking, Psa 1:1, so his feet may signify the principles on which he acts, and the dispositions of his mind. Ecc 5:1 : Keep thy foot when thou goest to the house of God. Agreeably to this, the feet of the messengers in Isaiah and of the apostles in this verse, may signify the validity of their mission - the authority upon which they acted, and any character or qualifications with which they were invested."