The sublime achievements of moral goodness are characterized by effortlessness-because it is of their essence to spring from love. 

The Middle Ages also said something about virtue that is no longer so readily understood-least of all by Kant's compatriots and disciples-they held that virtue meant: "mastering our natural bent"; what Aquinas says is that virtue makes us perfect by enabling us to follow our natural bent in the right way. In fact, he says, the sublime achievements of moral goodness are characterized by effortlessness-because it is of their essence to spring from love. 

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Just as the highest form of virtue knows nothing of "difficulty," so too the highest form of knowledge comes to man like a gift-the sudden illumination, a stroke of genius, true contemplation; it comes effortlessly and without trouble. 

- Josef Pieper

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Leisure: The Basis of Culture