St. Irenaeus asked that God strengthen them and show them the truth, keeping them from every error.
St. Irenaeus was an influential bishop of the 2nd century and did much to combat heresy, clearly defining true Christian doctrine.
Not only did he write about such truth, he also prayed for his readers, that they would find the truth in Jesus Christ.
Here is a short prayer from Against Heresies that asks God to protect those seeking the truth from every false doctrine.
Read more:10 inspiring quotes from Saint Irenaeus