And for thy proportion thou must beware, For therein mayst thou be beguil'd, Therefore thy Work that thou not mar.
AFter the knowledge of the true mate∣rial Subject, and its Preparation, the next main thing to be understood is the mystery of Proportion, which is a secret of no light concernment, for many erre therein. Thou shalt therefore under∣stand, that our Proportion is two-fold, Internal and External; the Internal pon∣dus is a Labyrinth in which all erre who know our Subject as many do, but not its Proportion. He who would effect any thing, must principally learn this which is set down in Golden words, in Bernard Trevisan his Treatise of the Chymical Mi∣racle: The Sulphur, saith he, which is in the Mercury, and predominates not, is the Fire alone which governs the whole Work;