Marc_Chagall,_1912,_Calvary_(Golgotha)_Christus_gewidmet,_oil_on_canvas,_174.6_x_192.4_cm,_Museum_of_Modern_Art,_New_YorkTo Susan Sturgis de Sastre
Colonial Club Cambridge
Cambridge, Massachusetts. April 19, 1909

You ask me what “Modernism” is precisely. It is not anything precise; but as a general tendency, it consists in accepting all the rationalistic views current or possible in matters of history and science, and then saying that, in a different sense, the dogmas of the Church may still be true. For instance, all miracles, including the Incarnation and Resurrection, are denied to be historical facts; but they remain, in some symbolic sense, theological truths. That is, they are normal ways in which religious imagination has expressed itself; and people ought to go on, in their devotions, using those expressions, just as they go on using a language or a style of dress that has naturally established itself. . . . Theologically considered, Modernism is untenable, like every theory of double truths

From The Letters of George Santayana:  Book One, [1868]-1909.  Cambridge, MA: The MIT Press, 2001.
Location of manuscript: Alderman Library, University of Virginia at Charlottesville