30. The foundation of this relation arifeth, First, from the similitude or proportion of the signe to the thing signified: for such a likenesse although it doe not make a Sacrament, yet it is required afore to those things which doe make a Sacrament, and is laid as a foundation to them. Secondly, from the word of institution, which consists of a command and a promise. The command doth impose a duty of using the Creatures to that holy end. The promise doth give us to believe that we shal not so use them in vaine. But this word of institution distinctly applied with fit prayers, is called the word of consecration, of blessing, the word of sanctification, and separation. 3. It is perfited with observation, and the use it selfe prescribed, of which here is so great force, that for default of it that is not a Sacrament to this or that person, being present in body or receiving, which to others is most effectuall.