(Image Source: Wikipedia Commons)

[The Seraphim] know that the greatest sin of society is not
the sin of the flesh, not the sin of man against man, or of
man against woman, or even of man and woman against
mankind. These sins cry to Heaven for vengeance, it is true;
but the sin that is at the root of all these, the sin of all sins is
the neglect of God by man.

(A Trappist author)