Some people tell a priest their mistakes.
Many people tell their mistakes to a god. 
Confession is when people admit their wrong thoughts or actions.
In the Catholic Church, this is called a sacrament. People tell their sins to a priest. The priest then helps them receive God's grace. 
Orthodox Christians have different ways to do this. They do not use booths. Instead, they often confess in the main part of the church. 
Lutherans also practice private confession. A pastor hears the person's sins. The pastor then says words of absolution. This means the person is forgiven. 
Confession is a way for people to admit their wrong thoughts and actions.
In the Catholic Church, this is known as the Sacrament of Penance. 

Catholicism has many different names for this sacred practice. Some people call it reconciliation or simply confession. The Church uses the words penance and reconciliation in its official books. It is a way to heal the soul. The Church teaches that it is like a joyful wedding banquet. It is not meant to be a scary criminal court. This practice has stayed mostly the same for many centuries.
Orthodox Christians have a very different way of practicing confession. 

Lutherans also practice private confession and absolution. 
Confession is the act of acknowledging sinful thoughts and actions.
In the Catholic Church, this is called the Sacrament of Penance. 

Catholic teaching describes the nature of these sins in different ways. Mortal sins are considered grave and must be confessed at the earliest opportunity.
Eastern Orthodox traditions follow a different method of practice. 
Many Orthodox believers choose a spiritual father to guide them. 
Lutheranism also maintains the practice of private confession and absolution. 
Different groups have different rules for how often they confess. In the Catholic Church, it is obligatory to confess serious sins at least once a year. In some Orthodox traditions, people confess before receiving Holy Communion. Other Patriarchates suggest confessing during the four fasting periods. Some monks on Mount Athos choose to confess their sins daily. There is also a rite called Mutual Forgiveness in Eastern churches. This involves an exchange between the priest and the congregation. It is used to maintain Christian charity and a humble spirit.
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