There is general agreement that the phrase "the gates of Hades" is poetic language for the power of death (see Isa. 38:10). What is meant is that the congregation of the new covenant will persist into the age to come despite all the efforts of the powers of darkness to destroy it. "The gates of Hades" may here represent a defensive posture: death will strive to hold in its prison house all who have entered its gates, but the Messiah's congregation will triumphantly storm the gates and rescue those destined for the life of the age to come.