The writer expresses deep gratitude for the comforting letter and verses received, highlighting the emotional balm they provided. They recount a painful experience with Jean-Jacques Rousseau, who, through manipulation and deceit, incited public opposition against them in Geneva, causing financial loss and personal distress. The writer underscores Rousseau’s hypocrisy and ingratitude, contrasting his actions with their own efforts and commitment to literary and personal integrity. They affirm their admiration for the recipient’s military and literary accomplishments, pledging lasting esteem and support.