A contradiction?

I put this question to you: the Blogging community. Where is the happy medium between 'humbling yourself before God' and believing in God and the power he has within you?

This is something I often struggle with. I seem to either:

• Be humble to the point of believing that I'm not worthy of God.
  

Or

• Be confident in Gods power within me for a while until I get a big head & think that it's my amazing faith that does it.