One of the easiest ways to dismiss an uncomfortable moral truth is to point to the failings of the person expressing it. Christians are sinners, sometimes spectacularly so, and hypocrisy can seriously undermine the credibility of their witness. But it does not make what they say untrue.

The Christian claim is not that we are morally superior to others, but that there exists an objective moral law which stands above all of us, including those who profess to follow it. We do not get to redefine right and wrong simply because we find obedience difficult.

Christianity demands two things of us: that we bear witness to the truth, and that we strive to live according to it. When we fail at the second, the answer is repentance, not abandoning the first.

The failure to live up to the truth does not make the truth any less true.