Petrus van Mastricht, A Treatise on Regeneration (p. 25)
Nor is the spiritual life in regeneration bestowed only upon the superior faculties of the soul, the understanding and will, but also upon the inferior or sensitive faculties: the affections, senses, and even the members of the body. Hence the apostle expressly ascribes sanctification not only to the spirit–by which he seems to understand the spiritual faculties, such as agree to spirits only, as the understanding and will–but also to the soul (psuche, properly the animal soul, form which we are called psuchickoi, natural or sensual, as it is rendered), which denotes the inferior faculties such as are common to brutes.
Samuel Willard, Sermon CXX, Compleat Body of Divinity
1. THAT there are two sorts of Actions performed by the Will, viz. Elicite and Imperate; the former immediately by it self, and the latter by the affections. The Elicite acts of the Will are in choosing or rejecting the Object before it. This act is performed inwardly by it, and belongs to the sovereignty of the Will in man, by vertue whereof he is a free Agent. Hence such a precept is given us, Amos 5.15. Hate the evil, and love the good. And that is given as a sign of a persons being capable of acting as a man, Isai. 7.16. For before the child shall know to refuse the evil, and chuse the good.
The Imperate acts of the will are those by which it puts its Elections in execution, and pursues them to effeect; in which it nextly makes use of the Affections, by which it manageth the whole man. Whether the Affections belong to the Will in man, and are only the various motions of it, or whether they be distinct faculties in him, and are seated in his inferior powers, I dispute not. It is certain that they are the instruments by which the Will performs its Imperate actions, and in the which it is either carried to or from the object.” 454-55 : Quest XXXI, Assembly’s Catechism