Whoever wishes to make progress in perfection should use...

Whoever 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.