I just looked up the quote I mentioned in my copy of Mere Christianity, and I thought I'd post some of the actual text here. Ever since I first read it, I've found it very helpful in maintaining perspective both with myself and in the way I approach and/or view those around me. There's something beautiful about the imagery of the naked soul:
"Human beings judge one another by their external actions. God judges them by their moral choices. When a neurotic who has a pathological horror of cats forces himself to pick up a cat for some good reason, it is quite possible that in God's eyes he has shown more courage than a healthy man may have shown in winning the V.C. [Victorian Cross... similar to a Congressional Medal of Honor.] When a man who has been perverted from his youth and taught that cruelty is the right thing, does some tiny little kindness, or refrains from some cruelty he might have committed, and thereby, perhaps, risks being sneered at by his companions, he may, in God's eyes, be doing more than you and I would do if we gave up life itself for a friend.
It is as well to put this the other way around. Some of us who seem quite nice people may in fact have made so little use of a good heredity and a good upbringing that we really are worse than those whom we regard as fiends. Can we be quite certain how we should have behaved if we had been saddled with the psychological outfit, and then the bad upbringing, and then with the power, say, of Himmler [the man who controlled the SS and Gestapo during Nazi reign]? That is why Christians are told not to judge. We see only the results which a man's choices make out of his raw material. But God does not judge him on the raw material at all, but on what he has done with it. Most of the man's psychological makeup is probably due to his body: when his body dies all that will fall off him, and the real central man, the thing that chose, that made the best or the worst out of this material, will stand naked. All sorts of nice things which we thought our own, but which were really due to a good digestion, will fall off some of us : all sorts of nasty things which were due to complexes or bad health will fall off others. We shall then, for the first time, see every one as he really was. There will be surprises."