His "Way of Perfection" began to circulate widely in manuscript and even more widely in unauthorised printed editions. A letter of approbation printed at the beginning of The Rule of Perfection is signed by a number of doctors of the Sorbonne, including André Duval, who introduced it to Vincent de Paul. Vincent's words, "Do not tread on the heels of Providence," are taken from Canfield. This treatise "The Will of God" was translated into Latin in 1625 by order of the Minister General of the Order.