“Since sanctification is a certain change in man, and since every change consists of a motion, it is customary to consider in it a terminus a quo, and a terminus ad quem.* The terminus a quo is the corruption of the image of God. But the terminus ad quem is the restoration of that image. For the old [man] is to be cast off, and the new man is to be put on. (Eph. 4:24). Hence it is also called conversion, namely from evil to good. (Is. 1:16, 17; Ps. 34:14).** Purge out the old leaven, that ye may be a new lump (1 Cor. 5:7).”
– Johannes Braun (1628-1708), Doctrina Foederum, sive Systema Theologica Didacticae et Elencticae, Vol. I, Pars. III, Cap. X, 10.
* For the sake of clarity to readers who might be unfamiliar with the Latin terminology, a terminus a quo refers to the starting point of something, literally meaning “the point from which,” whereas a terminus ad quem refers to the end or finishing point of something, literally meaning “the point [or end] to which.” In other words, Braun says that sanctification starts with the image of God being in a state of corruption in man, and ends with the image of God fully restored, upon glorification.
** Braun, in the original, here cites Ps. 34:15 (as it appears in the Vulgate), which is Ps. 34:14 in modern English Bibles.