I hope you will not misunderstand what I am going to say. I am not preaching, and Heaven knows I do not pretend to be better than anyone else. I am only trying to call attention to a fact; the fact that this year, or this month, or, more likely, this very day, we have failed to practise ourselves the kind of behavior we expect from other people.
There may be all sorts of excuses for us. That time you were so unfair to the children was when you were very tired. That slightly shady business about the money – the one you have almost forgotten – came when you were very hard up. And what you promised to do for old So-and-so and have never done – well, you never would have promised if you had known how frightfully busy you were going to be. And as for your behaviour to your wife (or husband) or sister (or brother) if I knew how irritating they could be, I would not wonder at it – and who the dickens am I, anyway?
I am just the same. That is to say, I do not succeed in keeping the Law of Nature very well, and the moment anyone tells me I am not keeping it, there starts up in my mind a string of excuses as long as your arm. The question at the moment is not whether they are good excuses. The point is that they are one more proof of how deeply, whether we like it or not, we believe in the Law of Nature. If we do not believe in decent behaviour, why should we be so anxious to make excuses for not having behaved decently? The truth is, we believe in decency so much – we feel the Rule of Law pressing on us so – that we cannot bear to face the fact that we are breaking it, and consequently we try to shift the responsibility.
For you notice that it is only for our bad behaviour that we find all these explanations. It is only our bad temper that we put down to being tired or worried or hungry; we put our good temper down to ourselves.
~ from Mere Christianity, by C.S. Lewis (paragraphing and emphasis mine)