Neither 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 ClairvauxFor I have learnt for a fact that nothing so effectively obtains, retains and regains grace, as that we should always be found not high-minded before God, but filled with holy fear.
Bernard of ClairvauxAnd truly, O man, if you concentrate hard on the state you are in it will be surprising if you have time for anything else.
Bernard of Clairvaux