Re: the joy of God answers this question - "Why did God take so much care, to make Creation glow - He could have made it black and white, and we would never know."
The 12 Fruits of the Holy Spirit are a result of the Virtues and the Gifts of the Holy Spirit working within us. The Fruits are: Charity, Joy, Peace, Patience, Kindness, Goodness, Generosity, Gentleness (also called Benignity), Faithfulness, Modesty, Continence (Self-control) and Chastity.
If we water and tend a fruit tree we will enjoy the fruit when it matures. Similarly, the working of the Gifts of the Holy Spirit and their associated virtues within us produces “fruits” in our spirit, which console and encourage us to ever greater virtue and deeper surrender to God. Since the Fruits of the Holy Spirit are produced in the human spirit by the working of the Gifts, the greater the operation of the Gifts the more evident will be the Fruits.