"Resist anything that leads to moodiness. Our prayer each day should be, "Let the joy of the Lord be my strength." Cheerfulness and joy were Our Lady's strength. This made her a willing handmaid of God. Only joy could have given her the strength to go in haste over the hills of Judea to her cousin Elizabeth, there to do the work of a handmaid. If we are to be true handmaids of the Lord, then we too, each day, must go cheerfully in haste over the hills of difficulties." Mother Teresa: Her Essential Wisdom, pg 74.
"Joy is very infectious. We will never know just how much good a simple smile can do. Be faithful in little things. Smile at one another. We must live beautifully." pg. 75