The Holy Spirit is the Third Divine Person of the Holy Trinity, the bond of love between the Father and the Son.
Jesus sent the Holy Spirit to build, animate, and sanctify the Church and bring souls into communion with God so that they bear fruit and give witness to Christ.
The Holy Spirit does this through the Church's proclamation of the Gospel, through the Sacraments, and through working in the moral and spiritual life of the Christian.
God's love has been poured into our hearts through the Holy Spirit. The gifts of the Spirit are permanent dispositions in the soul, making it more docile to God's promptings.
Through the power of the Spirit, Christians can bear much fruit, such as love, joy, peace, patience, kindness, and self-control.
The fruits are seen when we live less for self and walk more in the Spirit.
The Holy Spirit sanctifies us, makes us holy, through grace, which is a participation in the life of God. God's divine life is infused into the soul by the Spirit to heal it of sin and to sanctify it.
Faith and works are interrelated in God's plan of salvation. Being liberated from sin and becoming a son or a daughter of God is a free gift given to us through faith, but we remain in God's family and mature as his spiritual children through love and good works. Thus faith and love together lead us on toward eternal life.