The understanding that the gospel is built on the Messiah’s mission leads to the logical conclusion that accepting the gospel means accepting that atoning mission by repentance and baptism. We are built on the solid foundation of the Messiah’s glorious atonement in our behalf.
Reference: “Whoso… is baptized in my name shall be filled” may be a reference to the beatitude: “And blessed are all they who do hunger and thirst after righteousness, for they shall be filled with the Holy Ghost” (3 Ne. 12:6). Being “filled” with the Holy Ghost after baptism and repentance provides another essential gospel element.