The definitions of humanism are many, but let us here take it to be the attitude of those men who think it an advantage to live in society, and, at that, in a complex and highly developed society, and who believe that man fulfills his nature and reaches his proper stature in this circumstance. The personal virtues which humanism cherishes are intelligence, amenity, and tolerance; the particular courage it asks for is that which is exercised in the support of these virtues. The qualities of intelligence which it chiefly prizes are modulation and flexibility.

Introduction - The Portable Matthew Arnold (Viking Press, 1949)