“The amazing thing is that every atom in your body came from a star that exploded. And, the atoms in your left hand probably came from a different star than your right hand. It really is the most poetic thing I know about physics: You are all stardust. You couldn’t be here if stars hadn’t exploded, because the elements - the carbon, nitrogen, oxygen, iron, all the things that matter for evolution - weren’t created at the beginning of time. They were created in the nuclear furnaces of stars, and the only way they could get into your body is if those stars were kind enough to explode. So, forget Jesus. The stars died so that you could be here today.” 

― Lawrence M. Krauss, A Universe from Nothing: Why There Is Something Rather Than Nothing

I remember that when I first heard this quote, it changed a lot about the way I think about myself, my life and the world in general. The very thought of it makes life more meaningful... Just think about it – we are all stardust. This is something that a brain isn't able to comprehend and, at the same time, it's such an amazing, good, and liberating feeling.