In general, this song is about Ariel's realization of mortality. The reality of the inevitable end of his life hits him like lightning, but he's troubled because he can't be sure if he's lived his life according to the will of God (whatever god there may be) and, on the other hand, he's uncertain as to whether knowledge of the will of God alone would (or should) have any bearing on his moral decisions ("you know I can't/won't repent for all"). He comes to peace in the next three tracks after he realizes that the freedom to choose has always been in his hands ("The Black Halo"), every human in the world and throughout history faces the same dilemma ("Nothing Ever Dies"), and that, regardless of what any god or man might say to him, in the end the most important thing is that he can live with himself ("Memento Mori").
In general, this song is about Ariel's realization of mortality. The reality of the inevitable end of his life hits him like lightning, but he's troubled because he can't be sure if he's lived his life according to the will of God (whatever god there may be) and, on the other hand, he's uncertain as to whether knowledge of the will of God alone would (or should) have any bearing on his moral decisions ("you know I can't/won't repent for all"). He comes to peace in the next three tracks after he realizes that the freedom to choose has always been in his hands ("The Black Halo"), every human in the world and throughout history faces the same dilemma ("Nothing Ever Dies"), and that, regardless of what any god or man might say to him, in the end the most important thing is that he can live with himself ("Memento Mori").