Sigillatim vs in seed — OT proves Gospel in genere
Dogmas may also be drawn from a principle in two ways: item by item, distinctly and of themselves; or only in a general and indirect way, through something else.
Not every Christian dogma and ordinance can be proved from the Old Testament by itself, one by one. Baptism in the Name of the Father, the Son, and the Holy Spirit could not be shown from the Old Testament alone if that were our only principle of faith.
Yet everything that belongs to Gospel teaching can be proved from the Old Testament in general, because from it one can show effectively that Jesus of Nazareth is the Messiah and the Son of God promised by the Prophets — and therefore that his teaching is true and divine, and his ordinances to be received as divine.
What follows from a principle only in that general, mixed way is in it by force and in seed. What is proved from it distinctly, item by item, may be said to be in it expressly in a looser sense — though strictly 'expressly' means the same as clearly and immediately.
Latin
XI. Praeterea dogmata quaedam ex aliquo principio deduci possunt duobus modis. Primo sigillatim, distincte & per se. Deinde generatim confuse, & per aliud. Sic omnia religionis Christianae dogmata & instituta ex Scriptura veteris Testamenti probari non possunt per se & sigillatim. Ut, exempli gratia, fideles esse baptizandos in Nomine Patris, Filii, & Spiritus sancti ex veteri Testamento satis probari non posset, si nullum aliud fidei principium suppeteret praeter illam veterem Scripturam. Et tamen omnia quae ad Evangelicam doctrinam pertinent ex veteri Testamento in genere probari possunt, quatenus inde potest efficaciter demonstrari Jesum Nazarenum esse Messiam, & Dei Filium a Prophetis promissum: adeoque doctrinam illius veram & divinam esse, & ejus instituta tanquam divina a nobis amplectenda. Quae generatim & confuse tantum ex aliquo principio colligi, & deduci possunt, in eo continentur virtute atque in semine. Quae vero ex eo probantur distincte & sigillatim expresse dici possunt aliquo modo in eo contineri: licet strictiori sensu expresse idem significet ac diserte & immediate.