I don't know how to react to this quote because my reaction depends on exactly how I interpret this quote.  We are told to pray continually, so I agree 100% with that principle.  We should also have the nonstop attitude of repentance and gratitude that we are forgiven sinners, so I agree 100% there.  
If this quote is saying to just continually repeat the words, "Lord Jesus Christ, Son of God, have mercy on me, a sinner," then I disagree because Matthew 6:7 says, "“And when you are praying, do not use meaningless repetition as the Gentiles do, for they suppose that they will be heard for their many words."