A recent study has argued from theological and classicizing parallels that the first, anti-pagan book of Augustine’s De consensu euangelistarum belongs between 406 and 412 CE. This article defends the traditional dating ca. 400–405 CE, implied by Retractationes. Uncertainty over the dating of parallels in De trinitate 1–4 cautions against reliance on theological peculiarities (a variant of John 5:19 and the phrase unitas personae, both otherwise paralleled in the 410s CE or later), while a close review of the patterns of classical citation proves resemblance to De ciuitate dei to be superficial. Not only does Augustine demonstrably cite the same classical texts on widely separated occasions, De consensu euangelistarum 1 evinces little of Augustine’s later knowledge of Porphyry and Varro. The crowning proof comes, however, in a brief rebuttal to pagan complaints over contemporary misfortunes. Although he focuses on Rome’s religious history, Augustine omits any hint of Alaric’s sack (410 CE), the religious-political instability of 408–409 CE, or Radagaisus’ invasion of Italy (405–406 CE), all of key importance for later works. The book’s method, scope, and tenor place it neatly within the span 400–405 CE, as our first testimony to the interreligious milieu for which De ciuitate dei would later be aimed.

Several times, when faced with a difficult passage of scripture in Sermones ad populum, Augustine implores his audience, “knock and it shall be opened” (Matt. 7:7c; par. Luke 11:9c). Augustine uses this phrase to stress humility and the human need for God’s activity when interpreting scripture. Studying the archeological record of domestic architecture of locked doors in Roman North Africa elucidates Augustine’s message. Knowledge of the material culture shows that Augustine calls upon Christians to “knock” upon scripture as if it were a door, locked and barred in such a way that it could only be opened from inside. Thus, a reader of scripture is like a petitioner calling from outside a locked door, needing God to open its meaning. Augustine’s use of “knocking” contrasts with the metaphor of “keys” to scripture, which was favored by Tyconius and other early Christian writers. In De doctrina Christiana, Augustine expresses concern that “keys” could lead a person into overconfidence, expecting to unlock obscure passages of the Bible by his or her own power. Augustine’s frequent use of Matt. 7:7c is a call for exegetes to approach scripture with humility. All members of the totus Christus, great and small, must humbly knock. The image of “knocking” provides a versatile theological message: human effort is important, but the meaning of the Bible is ultimately unlocked by God’s activity.