Server's Prayer before Mass

One version is: '''Open my mouth, O Lord, to bless your Holy Name. Cleanse my heart from all evil and distracting thoughts. Enlighten my understanding and inflame my will that I may serve more worthily at your holy altar. O Mary, Mother of Christ the High Priest, obtain for me the most important grace of knowing my vocation in life. Grant me a true spirit of faith and humble obedience so that I may ever behold the priest as a representative of God and willingly follow him in the Way, the Truth, and the Life of Christ.'''