Nor iron bars a cage; The Meaning of Good and Evil

When Love with unconfinèd wings
Hovers within my gates,
And my divine Althea brings
To whisper at the grates;
When I lie tangled in her hair
And fetter’d to her eye,
The birds that wanton in the air
Know no such liberty.

Stone walls do not a prison make,
Nor iron bars a cage;
Minds innocent and quiet take
That for an hermitage;
If I have freedom in my love
And in my soul am free,
Angels alone, that soar above,
Enjoy such liberty.

Is there a fundamental definition of evil? Are there things which objectively possess this property independent of the perception of man? CS Lewis, when he was an atheist, found to his surprise that the concepts of good and evil couldn't be banished by the simple expedient of declaring the world meaningless.

My argument against God was that the universe seemed so cruel and unjust. But how had I got this idea of just and unjust? A man does not call a line crooked unless he has some idea of a straight line. ... Of course I could have given up my idea of justice by saying it was nothing but a private idea of my own. But if I did that, then my argument against God collapsed too--for the argument depended on saying that the world was really unjust, not simply that it did not happen to please my fancies. Thus in the very act of trying to prove that God did not exist--in other words, that the whole of reality was senseless -I found I was forced to assume that one part of reality--namely my idea of justice--was full of sense. Consequently atheism turns out to be too simple. If the whole universe has no meaning, we should never have found out that it has no meaning: just as, if there were no light in the universe and therefore no creatures with eyes, we should never know it was dark. Dark would be a word without meaning.

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