Lavater was one of the most ardent admirers of Mendelssohn.
Lavater was fired with the ambition to convert his friend to Christianity.
In the preface to a German translation of Bonnet's essay on Christian Evidences, Lavater publicly challenged Mendelssohn to refute Bonnet or if he could not then to "do what wisdom, the love of truth and honesty must bid him, what a Socrates would have done if he had read the book and found it unanswerable."
The boldness of some of his ideas cost him some valuable friendships, as that of Jacobi, Lavater and even of his early teacher Hamann.
He made several valuable acquaintances, among others Lavater and his brother-in-law Hartmann Rahn, to whose daughter, Johanna Maria, he became engaged.
The popular style, good illustrations and pious spirit pervading the writings of Lavater have given to them a popularity they little deserved, as there is no system in his work, which chiefly consists of rhapsodical comments upon the several portraits.
With Lavater the descriptive school of physiognomists may be said to have ended, as the astrological physiognomy expired with De la Belliere.
Moreau's edition of Lavater, in 1807, was somewhat along the same lines.
On the second of these journeys he revisited Friederike in Sesenheim, saw Lili, who had married and settled in Strassburg, and made the personal acquaintance of Lavater in Zurich.
Walzel (2 vols., 1898-1899); Goethe and Lavater, edited by H Funck (1901); Goethe and Osterreich, edited by A.
Lavater would have said I lack the bump of paternity.