Fervor is a fire that makes things boil and grow hot, just as fire causes water to boil. It is, properly speaking, charity on fire, and that is what you should have because a Daughter without Charity is like a body without a soul.
St. VincentWhoever wishes to make progress in perfection should use particular diligence in not allowing himself to be led away by his passions, which destroy with one hand the spiritual edifice which is rising by the labors of the other. But to succeed well in this, resistance should be begun while the passions are yet weak; for after they are thoroughly rooted and grown up, there is scarcely any remedy.
St. Vincent