If I am drowning in a rapid river, a man who still has one foot on the bank may give me a hand which saves my life. Ought I to shout back (between my gasps) ‘No, it’s not fair! You have an advantage! You’re keeping one foot on the bank’? That advantage—call it ‘unfair’ if you like—is the only reason why he can be of any use to me. To what will you look for help if you will not look to that which is stronger than yourself?
Such is my own way of looking at what Christians call the Atonement. But remember this is only one more picture. Do not mistake it for the thing itself: and if it does not help you, drop it.
C.S. Lewis, Mere Christianity (1952; Harper Collins: 2001) 59.