"strength to maintain the truth against every blast of vain doctrine"

"Deus, qui beato Irenaeo Martyri tuo atque Pontifici tribuisti, ut et veritate doctrinae expugnaret haereses, et pacem Ecclesiae feliciter confirmaret:  da, quaesumus, plebi tuae in sancta religione constantiam; et pacem tuam nostris concede temporibus.  Per"

O God, who have assigned to your blessed martyr and bishop Irenaeus that he both by the truth of doctrine subdue heresies and successfully establish the peace of the Church:  give to your people constancy in holy religion, and grant your peace in our times.  Through.

     Collect for the feast of St. Irenaeus, 28 June, Tridentine Missal and Breviary, translation (which could use some improvement) mine.  This is stronger than the revised collect of the post-Vatican II Missal, but to be honest, I like the paraphrase in Holy women, holy men:  celebrating the saints (2010; formerly Lesser feasts and fasts) even better:

Almighty God, who didst uphold thy servant Irenaeus with strength to maintain the truth against every blast of vain doctrine:  Keep us, we beseech thee, steadfast in thy true religion, that in constancy and peace we may walk in the way that leadeth to eternal life; through.

Almighty God, you upheld your servant Irenaeus with strength to maintain the truth against every blast of vain doctrine:  Keep us, we pray, steadfast in your true religion, that in constancy and peace we may walk in the way that leads to eternal life; through.