Abstract
This article intends to offer a general presentation of the way in which Saint Thomas Aquinas proceeded in his exegesis of sacred texts. The author concentrates on one of Aquinas’ most estimated biblical commentaries, his Lectura on the Gospel according to St. John. Aquinas combines great theological insight with an incipient development of some literary techniques. In his hermeneutics, he emphasizes the priority of the literal sense of Scripture, although this thesis does not lead him to present a purely natural interpretation. The supernatural mystery of God belongs to the literal sense of Scripture. This is why God, as the principal author of Scripture, might have intended to express different truths even within a single passage.