 He published an history of the Peace Prayer attributed to saint Francis of Assisi ("Lord, make me an instrument of your peace"), in which he demonstrated that this text, well known as the Prayer of Saint Francis and become in half a century one of the most famous worldwide prayers, appeared, anonymously, in 1912, in France, and has been wrongly attributed to saint Francis around 1925.A conscientious objector, he served during his obligatory civilian service (1985–87) at the "Cahiers de la Réconciliation", magazine of the MIR, French branch of the International Fellowship of Reconciliation (IFOR).He was editor of this magazine from 1987 to 2006.