Don't Let The Sun Go Down On Your Grievances Lyrics

Lyric discussion by Phonophobe 

Cover art for Don't Let The Sun Go Down On Your Grievances lyrics by Daniel Johnston

Why did Daniel choose to sing 'grieviance'? I think if he had sung 'grievances' the song would not have been so good, but I'm not sure why. Maybe it's something to do with him making the song more personal with his neologism...?