If you won't or don't - then you can't.

Question: What kind of person is unable to pray the Lord’s prayer?

Answer:
If you don’t know Christ … you can’t pray, “Our Father.”
If you glorify yourself … you can’t pray, “Hallowed be Thy name.”
If you reject His rules … you can’t pray, “Thy kingdom come.”
If you won’t submit … you can’t pray, “Thy will be done.”
If your life is only for here and now … you can’t pray, “On earth as it is in heaven.”
If you are self-sufficient … you can’t pray, “Give us our daily bread.”
If you won’t forgive … you can’t pray, “Forgive us our debts.”
If you seek sin … you can’t pray, “Lead us not into temptation.”
If you are a friend of evil … you can’t pray, “Deliver us from evil.”
If you build your own kingdom … you can’t pray, “Thine is the kingdom.”
If you want power … you can’t pray, “Thine is the power.”
If you always take credit … you can’t pray, “Thine is the glory.”