The author praises the King for his remarkable accomplishments and his profound support for both philosophical and literary works, even highlighting his protection of philosophers and writers who face persecution. He reflects on the unexpected and diverse interests of the King, noting his patronage of Deshoulieres’ works and his engagement with philosophical ideas. The author also laments the persecution of a philosopher, drawing a parallel with his own sufferings and the injustices faced by various notable individuals. He concludes by expressing gratitude for the King’s support and requesting its continuation until his final moments. Furthermoe, Wagnière endorsed ‘cette Lettre doit être de 1776’, but all editions have placed it in April 1777, except Koser-Droysen iii.404–406, who prefer May; as this is a reply to Frederick’s letter of 26 March (D20614), and as the king in turn answered it on 1 June, the above date is as near as we can get.

Voltaire offers to lodge Lépine’s son and his pupils at Ferney where he notes that other craftsmen from Geneva and elsewhere have taken refuge under his patronage.