Speak the Word Only!
We who have entered into a covenant with God through the blood of Jesus Christ are partakers in the promises of God, found in His Word, the Bible. We have given our life to God and promised to obey His Word. He in turn not only gives us the power to obey His commandments, but also is ready to pour His blessings upon us because we are now His children. Everything His Word promises is for us to receive. We must appropriate these blessings by faith.
Speaking the Word of God with a first person application is one way of expressing the kind of faith which pleases God. By confessing our obedience to a commandment of God we are boldly declaring our allegiance to God. We are trusting God for the power to walk in obedience to what He told us to do. It is important to confess like this because our verbal commitments steer the direction of our life. It is also important because many of God's promises to us are conditional upon the kind of faith which leads to obedience.
By confessing a promise in the first person we are boldly stating that we are the ones that it applies to. We definitely express faith that we are the ones who are going to receive the blessing.