Here is a section called "Benefits of the Sacrament" from a Coptic catechetical lecture:
* Abiding in Lord Jesus Christ: “He who eats My flesh and drinks My blood abides in Me, and I in him” (Jn. 6:56). Consequently we bear the fruits of the spirit, “He who abides in Me, and I in him, bears much fruit; for without Me you can do nothing” (Jn. 15:5)
* Obtaining Eternal Life: “Whoever eats My flesh and drinks My blood has eternal life, and I will raise him up at the last day… He who eats this bread will live forever” (Jn. 6:54,58)
* Growth & Maintenance of Our Spiritual Life: “Unless you eat the flesh of the Son of Man and drink His blood, you have no life in you… For My flesh is food indeed, and My blood is drink indeed… he who feeds on Me will live because of Me” (Jn. 6:53,55,57)
* Salvation & Remission of Sins: “This is My blood of the new covenant, which is shed for many for the remission of sins” (Mt. 26:28)
* Unification of Believers: “For we, being many, are one bread and one body; for we all partake of that one bread” (1 Cor. 10:17)
This is from the Armenian Apostolic Church:
The most important religious obligation of every Christian is the receiving of Holy Communion. Holy Communion is a sacrament by which the believer receives Christ’s Body and Blood in the form of bread and wine for remission of sins and the reception of eternal life. It is offered to the faithful during the celebration of the Divine Liturgy.
During the Lord’s supper Jesus Christ took bread, blessed it, broke it into pieces and gave it to His disciples, saying: "This is my body which is given for you. Do this in remembrance of me." Then he took the cup, gave thanks and offered it to them, saying: “Drink of it, all of you; for this is my blood of the covenant, which is poured out for many for the forgiveness of sins.” (Matthew 26:26-28, Mark 14:22, Luke 22:19) Giving the communion to His disciples, Our Lord, at the same time, gave them the commandment always to perform this sacrament.
Any member of the Church desiring to take Holy Communion must prepare for it. The first step in the preparation process is to consider our intentions. There must be a conscious will to be forgiven of our sins. In this, we must reflect on the ways in which we have sinned, be repentant and reconcile with people that we are not on good terms with. One should not have hate in his heart when accepting the body and blood of Jesus Christ.
The next step is to purify ourselves through fasting. It is common to fast for 6 hours, or from midnight prior to receiving Holy Communion. If health reasons prohibit fasting, special permission can be granted from the priest to take medicine or light nourishment.
The final step is to confess our sins and receive absolution from the priest. This is done by the faithful confessing their sins through the reading of a formal confession. This is read aloud by clergy and the faithful prior to Holy Communion. Private confession can also be declared before a priest. The priest upon receiving the confession grants absolution in the name of Jesus Christ, and states the following:
May God, the lover of man, have mercy upon thee and grant thee forgiveness of all thy sins both those which thou hast confessed and those which thou has forgotten. Therefore, with the priestly authority, and by Divine command that whatsoever you loose on earth shall be loose in heaven, I absolve thee of all participation in sin committed in thought, in word, and in deed, in the name of the Father, and of the Son, and of the Holy Spirit, and I re-instate thee in the Sacraments of the Holy Church, that whatsoever good thou mayest do, may be accounted to thee for good and for the glory in the life to come. Amen.
And a short piece from the Malankara Orthodox Church:
SANCTIFICATION THROUGH SACRAMENTS
The Triune God is Holy. God’s people also must be holy None can behold God without sanctification (Hebrews 12:14). The church being the Body of Christ is intrinsically holy. Holiness of the church is imparted to and shared by the members of the church, through the sacraments (Mysteries).
In the orthodox Tradition, although the term sacrament is not so common as the term ‘mystery ‘(rozo), the inner idea of the sacrament is endorsed and holistically acknowledged. The Latin term “sacramentum” is generally defined as the visible means of invisible grace and refers to certain specific events or acts or signs of Christian living. But according to the Orthodox understanding , sacramentality is the very nature of the new creation in Christ and therefore it sounds odd to identify certain acts or events or signs alone as ‘sacraments’ . However , the sacramentality , involved in our being born as the children of God in baptism , our participation on the life of the Incarnate Lord in eucharist etc , is well recognized in the Orthodox churches .
Sacramental life is the style and order of our life in Jesus Christ. Even though the materiality is preserved and maintained, it is considered to be a transformed – materiality as manifested on the mount of Transfiguration. Even though we continue to be in a earthly fellowship, we realize a heavenly fellowship around us, in sacramental life.
Matter and Body are no more to be looked down as embodiments of sin, corruption and death; rather they become the media for the manifestation of God’s Glory.
Our values and relations also get sanctified in sacramental life because in sacraments the inner core of life is the sharing of common gifts. Spirit of sharing is opposite to the spirit of exploitation and selfish boarding of resources. The church as the community of the kingdom of God imparts to its members the values of the shared life in and through the sacraments.