The French refer to it as the raison d'etre.  In English, we might call it ‘discovering our purpose.'  The New Testament uses the Greek verb eimi (eimi), which is the verb of ordinary existence, ‘to be.'  Each of these things refers to what we, in our more lucid moments, seek to discover.  What is the purpose of my life?  Why do I exist?  What is the big picture of life?  Where do I fit in? 

Ephesians 1:11-12, quoted above, makes it clear that, among other things we might mention, praising God's glory is intricately entwined in our very purpose for existing.  "That we might be for the praise of His glory" is a pregnant clause - it encompasses magnifying His great name, reciting his amazing deeds, glorifying His perfect character, singing of His wondrous attributes,  shouting aloud of his glory and his generosity, and a hundred other things.   God is by definition "Holy," a term that in Hebrew means "transcendent."  He is beyond our understanding, and yet we are called to strive to understand Him.  And an essential key to knowing God is in learning to praise, honor and glorify him intimately.