The tendency to overvalue hard work and the effort of doing something difficult is so deep-rooted that it even infects our notion of love. Why should it be that the average Christian regards loving one's enemy as the most exalted form of love? Principally because it offers an example of a natural bent heroically curbed; the exceptional difficulty, the impossibility one might almost say, of loving one's enemy constitutes the greatness of love. And what does Aquinas say? ‘It is not the difficulty of loving one's enemy that matters when the essence of the merit of doing so is concerned, excepting in so far as the perfection of love wipes out the difficulty. And therefore, if love were to be so perfect that the difficulty vanished altogether—it would be more meritorious still.
From Leisure: The Basis of Culture.