When you call upon Jesus Christ and say: O my dear Lord God, my Creator and Father, Jesus Christ, Thou one eternal God, you need not worry that the Father and the Holy Spirit will be angry on this account. They know that no matter which Person you call upon, you call upon all three Persons and upon the One God at the same time. For you cannot call upon one Person without calling upon the others, because the one, undivided divine Essence exists in all and in each Person. Conversely, you cannot deny any Person in particular without denying all three and the One God in His entirety, as I John 2:23 says: "Whosoever denieth the Son, the same hath not the Father."
(What Luther Says - para 3454, pp. 1082)