John 10:3

A Letter from Origen to Gregory

And applying yourself thus to the study of the things of God, with faithful prejudgments such as are well pleasing to God, knock at its locked door, and it will be opened to you by the porter, of whom Jesus says, "To him the porter opens."[4]

Clementine Homily III

that is, who are seeking the truth, and not finding it; and again, `My sheep hear my voice; '[47]

Letter of Origen to Gregory

For we require to study the divine writings deeply, lest we should speak of them faster than we think; and while you study these divine works with a believing and God-pleasing intention, knock at that which is closed in them, and it shall be opened to thee by the porter, of whom Jesus says,[5]