Sanctifying Grace

Baptism reestablish relation with God, through Jesus. Baptism connects the individual to Christ's death, burial, and resurrection. Christ put his seal upon us and given the Spirit in our hearts as a first installment. Baptism grants access to sanctifying grace. 

Sanctifying grace allows the Holy Spirit to dwell within the soul, making the baptized person a new creation in Christ, an adopted child of God, and an heir of heaven.

This grace is the source of growth in holiness and enables the practice of theological and moral virtues. Sanctifying grace,  is a supernatural gift from God, infused into the soul at Baptism, that makes a person holy and pleasing to God. It is a permanent disposition that enables the soul to live in communion with God and to act by His love. 

Rosary is an effective tool  for comprehending and experiencing the works of sanctifying grace to union with Christ.

sanctifying grace makes a person holy and pleasing to God by dwelling within the soul. It's a permanent state of grace that transforms the individual, allowing them to participate in God's divine life and act according to his will.

Catholic  has to live  a life aligned with sanctifying grace, growing in faith, and striving for holiness to union with Christ. Baptism initiates this process, providing the grace and spiritual resources necessary for this journey. The struggle against concupiscence becomes a central part of this ongoing spiritual battle.

Sanctifying grace is an habitual gift, a stable and supernatural disposition that perfects the soul itself to enable it to live with God, to act by his love. Source: Catechism of the Catholic Church #2000

Grace (gratia, Charis), in general, is a supernatural gift of God to intellectual creatures (men, angels) for their eternal salvation, whether the latter be furthered and attained through salutary acts or a state of holiness.
In the process of justification we must distinguish two periods: first, the preparatory acts or dispositions (faith, fear, hope, etc.); then the last, decisive moment of the transformation of the sinner from the state of sin to that of justification or sanctifying grace, which may be called the active justification (actus justificationis) with this the real process comes to an end, and the state of habitual holiness and sonship of God begins.