Sadly, we see it so often. Here is a Christian, he professes Christ, but he does all sorts of things that are wrong and wayward and he does not question his behaviour. So some Christian friend says, you should not be doing that; the Word of God says you should not do that. That pursuit, that activity is not for Christians. But he does not seem to care. He might be polite to you, but you have not succeeded in helping him. It has not checked his conduct; he has not paused, not for a moment. Why not? He is a Christian, he believes in Christ. But does he really? The authentic Christian has a conscience, the authentic Christian can be challenged. Today you see professing evangelical Christian doing things that are so worldly, even in the churches, which we should have no association with whatsoever. But you cannot challenge that person. If you do, some get angry with you; some just smile at you in a superior sort of manner as though you have come out of the Victorian age. They will not listen, they will not respond. There is no chord that can be touched. They are not even concerned. They do not say, ‘Well, if you can prove that to me from God’s Word, I have to take it seriously.’ No, not even that. But the authentic Christian has a conscience. He is ready to be challenged from the Word of God, ready to be corrected. Oh, that we will have an enlivened, active conscience, that we will be intensely conscientious. That is the mark of the authentic Christian, and his duty also to exercise it. If we have got out of that way, then we need to realise we are backslidden or something, we are cold. The conscience can no longer be touched, and that is so vital and that is so important. The authentic Christian follows the Lord, follows the Word, is exercised, troubled, convicted when off track and when challenged. He is not obdurate, sullen, unresponsive.