Lyric discussion by dopey 

Cover art for A Sunday lyrics by Jimmy Eat World

This song is talking about a relationship falling apart. They spent the weekend together, and on Sunday it ended. Now he is driving back home and thinking about how all the hopes and dreams “that you have carried” for the relationship are now useless and “fall out from your hands back to the ground.” Now he can look back and everything that seemed cloudy before is getting much clearer. He is saying, that in the pain brought about by the destruction of the relationship when “you lose it”, you learn.