Catechism of the Catholic Church
1832 - The fruits of the Spirit are perfections that the Holy Spirit forms in us as the first fruits of eternal glory. The tradition of the Church lists twelve of them: "charity, joy, peace, patience, kindness, goodness, generosity, gentleness, faithfulness, modesty, self-control, chastity."112
112 - Gal 5:22-23
22 But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, 23 gentleness, self-control; against such things there is no law. 24 And those who belong to Christ Jesus have crucified the flesh with its passions and desires.
25 If we live by the Spirit, let us also walk by the Spirit. 26 Let us not become conceited, provoking one another, envying one another.
By Saint John Marie Vianney
A soul that possesses the Holy Spirit tastes such sweetness in prayer, that it finds the time always too short; it never loses the holy presence of God. Such a heart, before our good Saviour in the Holy Sacrament of the Altar, is a bunch of grapes under the wine press. The Holy Spirit forms thoughts and suggests words in the hearts of the just. . . . Those who have the Holy Spirit produce nothing bad; all the fruits of the Holy Spirit are good. Without the Holy Spirit all is cold; therefore, when we feel we are losing our fervour, we must instantly make a novena to the Holy Spirit to ask for faith and love. . . . See, when we have made a retreat or a jubilee, we are full of good desires: these good desires are the breath of the Holy Ghost, which has passed over our souls, and has renewed everything, like the warm wind which melts the ice and brings back the spring. . . . You who are not great saints, you still have many moments when you taste the sweetness of prayer and of the presence of God: these are visits of the Holy Spirit. When we have the Holy Spirit, the heart expands - bathes itself in divine love. A fish never complains of having too much water, neither does a good Christian ever complain of being too long with the good God. There are some people who find religion wearisome, and it is because they have not the Holy Spirit.