God has aroused the spirit of kings and princes to root up from the earth the enemies of the Christian name. Therefore gird yourselves manfully and take up joyful arms for the name of Christ.
Bernard of ClairvauxNeither fear nor self-interest can convert the soul. They may change the appearance, perhaps even the conduct, but never the object of supreme desire... Fear is the motive which constrains the slave; greed binds the selfish man, by which he is tempted when he is drawn away by his own lust and enticed (James 1:14). But neither fear nor self-interest is undefiled, nor can they convert the soul. Only charity can convert the soul, freeing it from unworthy motives.
Bernard of Clairvaux