A sacrament is a sacred rite recognized as of particular importance and significance. There are various views on the existence and meaning of such rites.

Hexam's Concise Dictionary of Religion calls a sacrament "a Rite in which GOD (or Gods) is (are) uniquely active". But within Christianity the word is used in a more restricted sense.

The Catechism of the Catholic Church defines the sacraments as "efficacious signs of grace, instituted by Christ and entrusted to the Church, by which divine life is dispensed to us. The visible rites by which the sacraments are celebrated signify and make present the graces proper to each sacrament. They bear fruit in those who receive them with the required dispositions." The catechism included in the Anglican Book of Common Prayer defines a sacrament as "an outward and visible sign of an inward and spiritual grace given unto us, ordained by Christ himself, as a means whereby we receive the same, and a pledge to assure us thereof."

Some Protestant traditions avoid the word "sacrament". Reaction against the 19th-century Oxford Movement led Baptists to prefer instead the word "ordinance", practices ordained by Christ to be permanently observed by the church. "Sacrament" stresses mainly, but not solely, what God does, "ordinance" what the Christians do.

Mark Hart (born July 2, 1953, Fort Scott, Kansas), is a multi-instrumentalist best known for his participation as a member of Supertramp and Crowded House.

A student of classical music, Mark worked as a full time session musician with popular artists, notably the group Supertramp. He began his association with them in 1987 as a studio and touring musician, able to play several instruments and sing lead vocals. Hart shared the same manager as the band Crowded House, who suggested he fill in for Eddie Rayner, with session work for the band after they experienced difficulties replacing their keyboardist.

He contributed to Woodface in 1991 as a session musician, later joining the band fully a while after Tim Finn left, and is credited as a full member on Together Alone from 1993. He stayed with the band after founding drummer Paul Hester left, he is seen along with Neil Finn and Nick Seymour in the photographs from the sleeve for Recurring Dream, the 1996 greatest hits album. Hart played with the band during their farewell concert on the steps of the Sydney Opera House in November 1996, known as Farewell to the World.

Christopher Dwayne "Chris" Tomlin (born May 4, 1972) is an American Christian Contemporary Music artist, worship leader, and songwriter from Grand Saline, Texas, United States. He was a staff member at Austin Stone Community Church and is signed to EMI's sixstepsrecords. Tomlin leads worship at many Passion events. Some of his most well-known songs are "How Great Is Our God", "Jesus Messiah", "Amazing Grace (My Chains Are Gone)", and the recent song "Our God" which he co-wrote with Matt Redman, Jesse Reeves and Jonas Myrin. He is currently a worship leader at Passion City Church in Atlanta, Georgia with Louie Giglio and Christy Nockels.

He was awarded Male Vocalist of the Year at the 2006, 2007, 2008 GMA Dove Awards, and Grammy Award Winner for Best Contemporary Christian Music Album in 2012. He was named Artist of the Year in 2007. Tomlin released his seventh studio album, And If Our God Is for Us..., on November 16, 2010. He is one of the members of CompassionArt, a charity founded by Martin Smith (and Smith's wife, Anna) of the band Delirious?.