Sentence:  When the weak call the strong evil the move is not merely defensive; it is also an expression of that peculiar malice which Nietzsche referred to as <WSD>"ressentiment</WSD>". Those who cultivate humility and the other propitiatory virtues to cloak their weakness nourish an envious resentment against those stronger than themselves. 
Meaning of the word marked with <WSD> tags:  A sense of resentment arising from suppressed feelings of envy and hatred, often leading to a frustrated sense of inferiority, with various social repercussions. (from 19th c.)