From the liturgy of John Chrysostom, 4th century:
Shine within our hearts, loving Master, the pure light of Your divine knowledge, and open the eyes of our minds that we may comprehend the message of your Gospel. Instill in us, also, reverence for Your blessed commandments, so that having conquered sinful desires, we may pursue a spiritual life, thinking and doing all those things that are pleasing to You. For You, Christ our God, are the light of our souls and bodies, and to You we give glory together with Your Father who is without beginning and Your all holy, good, and life giving Spirit, now and forever and to the ages of ages. Amen.
Adapted by M.D. Bush
From the Strasbourg Liturgy of 1539:
Almighty, gracious Father, since our whole salvation depends upon our true understanding of your holy Word, grant to all of us that our hearts, being free from worldy things, may hear and understand your holy Word with all diligence and faith, that we may rightly understand your gracious will, cherish it, and live by it with all our hearts, to your praise and honor; through our Lord Jesus Christ. Amen.