Lyric discussion by candykaos 

Cover art for 100 Suns lyrics by 30 Seconds to Mars

100 Suns is the title of a book which shows 100 photos of nuclear bombs and was inspired by a quote stating that a detonating nuclear bomb is like the glowing of a thousand suns. I think the song says he doesn't believe in the concepts and creations of humanity/society and that all of this will just be destroyed by ourselves anyways (100 suns until we part). He believes only in those things that weren't artificially created by society(the beating of our hearts, the truth of who we are).

Song Meaning

I definitely agree with this. I think Jared is also talking about how we (humans and all life) are connected by powerful forces of the universe all the time without even knowing e.g. 'the beating of our hearts' line. In my opinion, this song is about showing compassion and empathy towards other people so that we are "we" not "me, me, me"