Love

we exist because of God's love.. i think that would answer the question.. but i will not be stupid to give just that one line answer.. our parents marry and conceived us.. meaning, in the first place, we exist because of love [been stating that twice now].. it is like food, we only live a short life without it.. [at least we lived,huh..]

yes i can human can live without love but human can't live without food water oxegen