Normally, you'd expect a song to have verses and a chorus that is repeated about three times, and maybe also a bridge. But modern rock songs often don't fit in this pattern, "I believe" certainly doesn't. I couldn't even decide which part might serve as chorus. The part that I call "C" certainly occurs most often, and it is repeated at the end of the song. That should predestine it as THE chorus. On the other hand it doesn't stand out musically in a way you'd expect of a real chorus, i.e. marking the climax of a song.
Why does all this matter to me at all, being only the lyricist? It is because of the hook or hook line, and the title, which ideally should be identical. If Markus and I should make "I believe in our love" the title then this should also make the hook line that is repeated several times as part of chorus, preferably at the end of the chorus so it stands out most.
Another aspect is that the chorus is supposed to convey the key message of the song. This repeated part we call chorus marks the main difference between poems and lyrics.
Have another look at our structure that I've described as A - A - B - C - A - B - C - C - C - C
Not only doesn't "C" musically stand out that much, it is also repeated four times at the end. If I chose "C" as the chorus its first occurrence would come rather late, and the same text would be repeated four times at the end. Not a good idea! Placing the hook line in part "A" - which is what I intend - would neither make part "A" the chorus nor put enough weight on the key message. On the other hand, there is no "real" chorus and part "B" only occurs twice, though in positions typical for a chorus ...
The verses should provide the story or the thoughts that lead to the central message contained in the chorus. Now here's another problem! Part "C" comes too late to lead up to the conclusion, and there are only two parts "B" to tell the story.