The roote shewes the nature of the branch.  Zeale comes of [Greek:  zo], a word framed of the very sound and hissing noise, which hot coales or burning iron make when they meete with their contrary.  In plaine English, zeale is nothing but heate:  from whence it is, that zealous men are oft in Scripture sayd to burne in the spirit. [Greek:  zeontes pneumati].

Hee that doth moderately or remisly affect any thing, may be stiled Philemon, a lover; he that earnestly or extreamely, Zelotes, a zelot; who to all the objects of his affections, is excessively and passionately disposed, his love is ever fervent, his desires eager, his delights ravishing, his hopes longing, his hatred deadly, his anger fierce, his greefe deep, his feare terrible.  The Hebrewes expresse these Intensions by doubling the word.  This being the nature of zeale in generall, Christian zeale of which wee desire onely to speake, differs from carnall and worldly, chiefly in the causes and objects.

It is a spirituall heate wrought in the heart of man by the holy Ghost, improoving the good affections of love, joy, hope, &c. for the best service and furtherance of Gods glory, with all the appurtenances thereof, his word, his house, his Saints and salvation of soules:  using the contrarie of hatred, anger, greefe, &c as so many mastives to flie upon the throat of Gods enemies, the Divell, his Angels, sinne, the world with the lusts thereof.  By the vertue wherof a Zealot may runne through all his affections, and with David, breath zeale out of every pipe, after this manner for a taste;

[Sidenote:  Psalme Love.]

How doe I love thy Law (O Lord) more then the hony or the hony-combe, more then thousands of silver and gold!

[Sidenote:  Hatred.]

Thine enemies I hate with a perfect hatred.

[Sidenote:  Joy.]

Thy testimonies are my delight:  I rejoyce more in them, then they that finde great spoyles, more then in my appoynted food.

[Sidenote:  Grief.]

Mine eyes gush out rivers of teares.  Oh that my head were a fountain of teares, because they destroy thy Law.

[Sidenote:  Hope.]

Mine eyes are dimme with wayting:  how doe I long for thy salvation?

[Sidenote:  Feare.]

Thy judgements are terrible, I tremble and quake, etc.

Look what pitch of affection the naturall man bestowes upon his dearest darling, what unsatiable thirst the covetous worldling upon his Mammon, the ambitious upon his honour, the voluptuous upon his pleasure; the same the Christian striveth in equall, yea, (if possible) farre exceeding tearmes to convert and conferre upon God and his worship.

In briefe, to open a little crevise of further light, and to give a little glimpse of heat:  Zeale is to the soule, that which the spirits are to the bodie; wine to the spirits, putting vigour and agility into them.  Whence comes that elegant Antithesis in the Scripture. Bee not drunke with wine wherein is excesse, but be filled with the Spirit.