Fighting Distractions in Prayer

During Bible study this week, the topic of distractions in prayer arose. Apropos, I found this prayer in my breviary:



Lord, open my lips to praise your holy name.
Cleanse my heart of any worthless, evil or distracting thoughts.
Give me the wisdom and love necessary to pray with attention,
reverence and devotion.
Father, let my prayer be heard in your presence,
for it is offered through Christ our Lord.
Amen.