One truth that really struck me is that I am not God. Now I know that is obvious, but sometimes we act like we are God, carrying the weight of the world on our shoulders.
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I really like this quote from NT Wright in Surprised by Hope:
To embrace the ascension is to heave a sigh of relief, to give up the struggle to be God (and with it the inevitable despair at our constant failure), and to enjoy our status as creatures: image-bearing creatures, but creatures nonetheless.