What Do Catholics Believe about Entire Sanctification?

[Sean_W]

Easy enough, what do they believe about the matter? The term might be better recognized as the infilling of the Holy Spirit, Christian perfection, or heart purity. In general it was developed out of the Wesleyan Holiness line of thought that a person can be made complete in their love for God and others where sinning in general decreases and is then replaced with a growing total love for God and for ones neighbor. If not would there be room for this belief? Also keep in mind that Wesley never understood this as to mean a sinless perfection, but a completion in our character from the Greek term teleos** and being set apart for use by God.

 

[George_Stegmeir]

John Wesley was trying to reform the Anglican Church, which unfortunately had fallen into practicing mere ritual by rote, ignoring, in his eyes, the inner meanings of the prayers.
What he was trying to do was achieve that what was lost when the Anglican Church separated from Rome and lost the transubstantiation of the Host at Mass.
He tried to get back what we Catholics have always had: the Sacraments of Confession and The Holy Eucharist. Together, both of these give mankind Entire Sanctification.

 

[ChantFanJon]

We believe that we are conformed to the image of Christ primarily through the sacraments.

Baptism

Holy Baptism is the basis of the whole Christian life, the gateway to life in the Spirit (vitae spiritualis ianua),4 and the door which gives access to the other sacraments. Through Baptism we are freed from sin and reborn as sons of God; we become members of Christ, are incorporated into the Church and made sharers in her mission: "Baptism is the sacrament of regeneration through water in the word."5 (CCC 1213)

Confession

Christ instituted the sacrament of Penance for all sinful members of his Church: above all for those who, since Baptism, have fallen into grave sin, and have thus lost their baptismal grace and wounded ecclesial communion. It is to them that the sacrament of Penance offers a new possibility to convert and to recover the grace of justification. The Fathers of the Church present this sacrament as "the second plank [of salvation] after the shipwreck which is the loss of grace."4 (CCC 1446)

Eucharist

"The Eucharist is the efficacious sign and sublime cause of that communion in the divine life and that unity of the People of God by which the Church is kept in being. It is the culmination both of God’s action sanctifying the world in Christ and of the worship men offer to Christ and through him to the Father in the Holy Spirit."138 (CCC 1325)

You may want to take a look at the catholic understanding of the stages of the spiritual life.
This page on newadvent is a good introduction:
newadvent.org/cathen/14254a.htm

Furthermore, I recommend that you take a look at “The Way of Perfection”
by St. Theresa de Avila