panglossian [pænˈglɒsiən] a.
1.) Blindly or naively optimistic (American Heritage Dictionary of the English Language).
Etymology: After Pangloss, an optimistic professor in Candide, a satire by Voltaire. Pangloss believes that 'all is for the best in the best of all possible worlds,' parodying the philosophy of Gottfried Wilhelm Leibniz.
"Thales, serene and apparently wise, argues for water as the first principle, while remaining blind to the catastrophes of Walpurgis Night. Anaxagoras, apostle of fire, is a revolutionary apocalyptic like Blake's Orc or the actual visionaries who helped bring on the French Revolution. Since Anaxagoras is left prostrate upon the ground, adoring Hecate while blaming himself for disasters, the palm is clearly awarded to the sweet-tempered if rather too Panglossian Thales" (The Western Canon, Harold Bloom, 1994).
(Un philosophe et un ours dans un paysage fluvial montagneux, Jean-Charles Tardieu, ~1828)
I'm not actually sure that that's how the painting is referred to in French. I could not find the answer anywhere on the google. So, if anyone out there is a French-speaking art historian (I'm looking at you here Bibi), I'd appreciate some help. Thanks for reading!