Strengthened by Grace

Lucas and I had a conversation about grace yesterday.  I was thinking about it today with Eric.  A phrase in the book of Hebrews is "strengthened by grace."  I find it very hard to define grace.  I think I might know it when I see it, but I'm not sure I can explain it in words.  To me, this may be one of the greatest but hidden truths of Christianity.  Also...maybe we have to experience it before we can try and explain it.  I know one thing...I want to be strengthened by grace.  I know grace and gift are very similar words.  Maybe it has something to do with being strengthened by God's gifts instead of our efforts, our sweat, our knowledge, our wisdom.  My whole body seems to long for this reliance on grace instead of myself...and yet I struggle to let grace be enough.