But not all change is good; discernment and wisdom, informed by the Scriptures, need to be applied, often to tease out what is beneficial and what is potentially erroneous and harmful in a theory of change. So for example, socialism began by questioning why most of a nation's resources end up in the hands of a small elite.

"I was deceived by John Smyth and first beaten in Smyth's shed in late August 1981. I recall being beaten twice more, the last in early December 1981. After that, I never went again.

"On 12 February 1982, I reported the beatings to the minister of the church I was attending at the time."

Smyth chaired the Iwerne Trust - now named the Titus Trust - between 1974 and 1981 during which time he abused young men at the evangelical summer camps run by the charity.

Wilde's point is a subtle one, but it has deep echoes in recent psychological research. A 2017 paper by economists at Chicago University found that working for a socially responsible company increased the tendency of people to act unethically. The authors called it "moral licensing": the finding that when people do good, they sometimes feel they have more latitude to do bad.

John Smyth, who died in 2018, was the chair of the Iwerne Trust for almost a decade (1974-81) and present at many camps. Accounts of abuse by Smyth, who was a QC, or Queen's Counsel -- a senior counsel -- in the British legal system, first came to public notice in 2013 when a victim reported his experiences to the Diocese of Ely. Much of the publicity then focused on the presence of a young Justin Welby at many Iwerne camps, as a dormitory officer.