Why Do We Ask God to 'Lead Us Not Into Temptation' in the Lord's Prayer?

A caller named Samuel asks Father Dave about the wording in the Our Father. "I don't know if maybe I'm overthinking this, but in the Lord's Prayer, there's that part we say, 'lead us not into temptation.' Why do we say that?" Samuel asks. "I just took it as a given that there's no circumstance in which God would deliberately tempt us to sin, and I was just wondering what the significance was of asking God to not lead us into temptation."