We may know that we have faith, 1.
From the testimony of the Holy Ghost, and by the true and unfeigned desire which
we have to embrace and receive the benefits which Christ offers unto us. (The
Commentary of Zacharias Ursinus: On the Heidelberg Catechism—The Protestant
Christian Doctrines, Dating to 1563 [trans. G. W. Williard; Pantianos
Classics, 1888], 131)