Cyril of Jerusalem

Someone will say, "What, then, is sin? Is it an animal? An angel? A demon? What is this which infects us?" Rest assured it is not an enemy attacking from without but an evil springing up within you. "Let your eyes look straight ahead," and there exists no evil desire. If you do not steal the property of others, robbery is at an end. Be mindful of the judgment and neither fornication nor adultery nor murder nor any wickedness will prevail over you. …

Catechetical Lecture 2:2 ↗

Bede

Let your eyes look straight ahead, etc. Learn diligently the path of justice on which you ought to enter, and cautiously foresee in all things you intend to do what end they are destined to reach. This means that the eyelids of your eyes looking straight ahead should precede your steps, anticipating the good work you are going to do with diligent thought, and, considering that it is according to God, foresee it by meditating.

Commentary on Proverbs ↗

Hippolytus of Rome

He "looks right on" who has thoughts free of passion; and he has true judgments, who is not in a state of excitement about external appearances. When he says, "Let thine eyes look right on," he means the vision of the soul; and when he gives the exhortation, "Eat honey, my son, that it may be sweet to thy palate," he uses "honey" figuratively, meaning divine doctrine, which restores the spiritual knowledge of the soul. …

Hippolytus Exegetical Fragments ↗