It's your duty to love

...we tend to think that spontaneous actions are genuine while others performed from a sense of duty are stifled, artificial, and contrived. We especially think this way if we are considering questions 'of the heart.' Doing one's duty is thought to be restrictive to true love.

But the Bible defines love as a whole-hearted keeping of God's commandments. The greatest act of love was certainly the death of Christ for His people, and that act of love was not offered on an emotional high. It was a bitter grief for Christ to drink the cup of God's wrath, but that grief does not take away from His love fur us; rather, it adds to it. 

When we come to our duties gladly, it helps us to discipline our emotions. 

p43 Reforming Marriage