C.S. Lewis on Goodness and/or infallibility

 "“Yes. On my view one must apply something of the same sort of explanation to, say, the atrocities (and treacheries) of Joshua. I see the grave danger we run by doing so; but the dangers of believing in a God whom we cannot but regard as evil, and then, in mere terrified flattery calling Him ‘good’ and worshiping Him, is still greater danger. The ultimate question is whether the doctrine of the goodness of God or that of the inerrancy of Scriptures is to prevail when they conflict. I think the doctrine of the goodness of God is the more certain of the two. Indeed, only that doctrine renders this worship of Him obligatory or even permissible.

To this some will reply ‘ah, but we are fallen and don’t recognize good when we see it.’ But God Himself does not say that we are as fallen as all that. He constantly, in Scripture, appeals to our conscience: ‘Why do ye not of yourselves judge what is right?’ — ‘What fault hath my people found in me?’ And so on. Socrates’ answer to Euthyphro is used in Christian form by Hooker. Things are not good because God commands them; God commands certain things because he sees them to be good. (In other words, the Divine Will is the obedient servant to the Divine Reason.) The opposite view (Ockham’s, Paley’s) leads to an absurdity. If ‘good’ means ‘what God wills’ then to say ‘God is good’ can mean only ‘God wills what he wills.’ Which is equally true of you or me or Judas or Satan.”