I love the journal entry in St. Therese's Story of a Soul regarding a sister she found disagreeable. Even using the word, disagreeable, I feel she is being very kind. We encounter people on a daily basis that can be mean, rude, obnoxious, troublesome, etc. And the key to our happiness and sanctity is to love them as Jesus would. And, admittedly it is very difficult.
Here is what St. Therese of Lisieux wrote in her Story of a Soul, "There is in the Community a Sister who has the faculty of displeasing me in everything, in her ways, her words, her character, everything seems very disagreeable to me. And still, she is a holy religious who must be very pleasing to God.
4 Ways to Handle a Difficult Person... According to St. Therese of Lisieux:
1. Charity must not consist in feelings, but in works.
"Not wishing to give in to the natural antipathy I was experiencing, I told myself that charity must not consist in feelings, but in works.; then I set myself to doing for this Sister what I would do for the person I loved most."
2. Pray for the person as you are dealing with them.
"I prayed to God for her, offering Him, all her virtues and merits. I felt this was pleasing to Jesus; for there is no artist who doesn't love to receive praise for his works, and Jesus, the Artist of souls is happy when we don't stop at the exterior, but, penetrating into the inner sanctuary where He chooses to dwell, we admire its beauty."
3. Don't engage in the argument, instead smile and change the subject.
"I wasn't content simply with praying very much for this Sister who gave me so many struggles, but I took care to render her all the services possible, and when I was tempted to answer back in a disagreeable manner, I was content with giving her my most friendly smile, and with changing the subject of conversation, for the Imitation says, "It is better to leave each one in his own opinion than to enter into arguments."
4. Smile, a lot.
"Frequently, when I was at recreation (I mean during the work periods) and had occasion to work with this Sister, I used to run away like a deserter whenever my struggles became too violent. As she was absolutely unaware of my feelings for her, never did she suspect the motives for my conduct and she remained convinced that her character was very pleasing to me. One day at recreation she asked in almost these words: "Would you tell me, Sister Therese of the Child Jesus, what attracts you so much toward me; every time you look at me, I see you smile?" Ah! what attracted me was Jesus hidden in the depths of her soul; Jesus who makes sweet what is most bitter. I answered that I was smiling because I was happy to see her (it is understood that I did not add that this was from a spiritual standpoint).
Source: Story of a Soul, by St. Therese of Lisieux (Chapter X: The Trial of Faith)