We shouldn't deny the 'existence' of these problems. [=we shouldn't deny that these problems are present or real]
long before the country had 'come into existence' [=begun to exist; come to have actual being]
I owe my very 'existence' [='life'] to their courage. [=I am alive because of their courage]
(..) this one to you. "Dear mom, you don't need to come get me anymore. Burn the other letter. What Ben and I have created here may be unique in all of human existence. We created a paradise out of Plato's Our children shall be philosopher kings. It makes me so (..)2016 Captain Fantastic