"Joy is not simply a matter of temperament. In the service of God and souls, it is always hard to be joyful all the more reason why we should try to acquire it and make it grow in our hearts.
"Joy is prayer; joy is strength; joy is love; joy is a net of love by which we catch souls. God loves a cheerful giver. She gives most who gives with joy. If in the work you have difficulties and you accept them with joy, with a big smile in this like in any other thing they will see your good works and glorify the Father. The best way to show your gratitude is to accept everything with joy. A joyful heart is the normal result of a heart burning with love.
"Joy is a need and power for us, even physically. A sister who has cultivated a spirit of joy feels less tired and is always ready to go on doing good. The devil is a carrier of dust and dirt he uses every chance to throw what he has at us. A joyful heart knows how to protect itself from such dirt: Jesus can take full possession of our soul only if it surrenders itself joyfully. St. Teresa was worried about her sisters only when she saw any of them lose their joy. God is joy. He is love. A sister filled with joy preaches without preaching. A joyful sister is like the sunshine of God's love, the hope of eternal happiness, the flame of burning love.
"In our society, a cheerful disposition is one of the main virtues required for a Missionary of Charity. The spirit of our society is total surrender, loving trust, and cheerfulness. That is why the society expects us to accept humiliations readily and with joy; to live the life of poverty with cheerful trust; to imitate the chastity of Mary, the cause of our joy; to offer cheerful obedience from inward joy; to minister to Christ in his distressing disguise with cheerful devotion." TS, 46-47