Revelation 3:18

Buying being the usual way amongst men to procure what they want, it is not to be wondered at, that the procuring of that spiritual blessing here mentioned is expressed under this notion; though our buying of God spiritual good things be (as the prophet expresseth it, Isaiah 55:1) without money and without price. It is not to be doubted, but that which is here propounded to be bought (that is, obtained, and procured by such ways and means as God hath directed) is Christ himself, with all his benefits, in whom there is a sufficient spiritual supply for all our spiritual wants; that which to the soul will answer whatever gold serveth the body for; and which to the soul answereth what clothing is to the body, viz. righteousness, wherein a soul may stand before God; and that which will answer what salves are to the body for the cure of its wounds, viz. consolation, and healing of all spiritual wounds and infirmities; in short, whatever thou hast need of, considered either as poor, wretched, and miserable, or as blind and naked.