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]
(..) I have not done anything for me since . You do what you have to do. But don't think about sucking me into this with you. Hayden was the low point of my existence... ...and I vowed I would never go back to that godforsaken place! Never, ever, ever! Never! Never, ever, ever! I hate you. (..)2009 17 Again