D'Alembert commended him to Voltaire, then at Berlin.

The king was absent, but Voltaire gave royal protection to the fugitive until Frederick's return.

De Prades was then at once taken into favour and appointed reader to the king.

He proved but a poor martyr, however, for he afterwards retracted his heresies, got a benefice, and was put into prison by Frederick for giving information to his French countrymen during the Seven Years' War.[129] Unfortunately neither orthodoxy nor heterodoxy has any exclusive patent for monopoly of rascals.
Meanwhile Diderot wrote on his behalf an energetic and dignified reply to the aggressive pastoral.

This apology is not such a masterpiece of eloquence as the magnificent letter addressed by Rousseau ten years later to the archbishop of Paris, after the pastoral against Emilius.
But Diderot's vindication of De Prades is firm, moderate, and closely argumentative.