so here's my question

Okay, as typically happens with most U2 songs, I like Electrical Storm more with every listen, but for a song to mean something to me, the lyrics have to have some meaning, they can't just be throwaway lines to make the song sound good. So, with that in mind, can anybody tell me what this line means:

And if the sky can crack, there must be some way back
for love and only love.

???