A vocation (Latin vocātiō - a call, summons) is an occupation to which a person is specially drawn or for which he or she is suited, trained, or qualified. Though now often used in non-religious contexts, the meanings of the term originated in Christianity.
Use of the word "vocation" before the sixteenth century referred firstly to the "call" by God to the individual, or calling of all humankind to salvation, particularly in the Vulgate, and more specifically to the "vocation to the priesthood", which is still the usual sense in Roman Catholicism. Roman Catholicism recognizes marriage and virginity or celibacy as the two vocations. Martin Luther, followed by John Calvin, placed a particular emphasis on vocations, or divine callings, as potentially including most secular occupations, though this idea was by no means new.
Calvinism developed complex ideas about different types of vocations of the first type, connected with the concepts of Predestination, Irresistible grace, and the elect. There are the vocatio universalis, the vocatio specialis, only extended to some. There were also complex distinctions between internal and external, and the "vocatio efficax" and "inefficax" types of callings. Hyper-Calvinism, unusually, rejects the idea of a "universal call" to repent and believe, held by virtually all other Christian groups.
The great idea of vocation is central to the Christian belief that God has created each person with gifts and talents oriented toward specific purposes and a way of life. In the broadest sense, as stated in the Catechism of the Catholic Church, "Love is the fundamental and innate vocation of every human being" (CCC 2392). More specifically, in the Orthodox and Catholic Churches, this idea of vocation is especially associated with a divine call to service to the Church and humanity through particular vocational life commitments such as marriage to a particular person, consecration as a religious, ordination to priestly ministry in the Church and even a holy life as a single person. In the broader sense, Christian vocation includes the use of one's gifts in their profession, family life, church and civic commitments for the sake of the greater common good....source: http:(//vocare.org/)
Christian views on work 
Many Christian theologians appeal to the Old Testment Book of Genesis in regards to work. According to Genesis 1, human beings were created in the image of God, and according to Genesis 2, Adam was placed in the Garden of Eden to "work it and keep it" (2:15, ESV). Dorothy L. Sayers has argued that "work is the natural exercise and function of man – the creature who is made in the image of his Creator." Likewise, John Paul II said in Laborem Exercens that by his work, man shares in the image of his Creator.
Christian theologians see the Fall of man profoundly affecting human work. In Genesis 3:17, God said to Adam, "cursed is the ground because of you; in pain you shall eat of it all the days of your life" (ESV). Leland Ryken points out that, because of the Fall, "many of the tasks we perform in a fallen world are inherently distasteful and wearisome." Through the Fall, work has become toil, but John Paul II says that work is a good thing for man in spite of this toil, and "perhaps, in a sense, because of it" because work is something that corresponds to man's dignity and through it he achieves fulfilment as a human being. The Fall also means that a work ethic is needed. As a result of the Fall work has become subject to the abuses of idleness on the one hand, and overwork on the other. Drawing on Aristotle, Ryken suggests that that the moral ideal is the golden mean between the two extremes of being lazy and being a workaholic.
Some Christian theologians also draw on the doctrine of redemption to discuss the concept of work. Oliver O'Donovan points out that although work is a gift of creation, it is "ennobled into mutual service in the fellowship of Christ."
Leland Ryken argues for seeing the call of God to a particular occupation as a reflection of the gospel call, and suggests that this implies vocational loyalty – "modern notions of job become deficient" and "the element of arbitrariness of one's choice of work" is removed.
Modern vocational examples 
Since the establishment of Vocational Guidance in 1908 by the engineer Frank Parsons, the use of the term “vocation” has evolved, with emphasis shifting to an individual's development of talents and abilities in the choice and enjoyment of a career. This semantic expansion has meant some diminishment of reference to the term's religious meanings in everyday usage.
Literary clarification 
These books have attempted to define or clarify the term vocation.
- States of the Christian life and vocation, according to the doctors and theologians of the Church
- A Theology of the Laity by Hendrik Kraemer ISBN 978-1-57383-031-7
- The Fabric of this World by Lee Hardy ISBN 978-0-8028-0298-9
- Your Work Matters to God by Doug Sherman and William Hendricks ISBN 978-0-89109-372-5
- The Call by Os Guinness ISBN 978-0-8499-4437-6
- The Preaching Life by Barbara Brown Taylor ISBN 978-1-56101-074-5
- Let Your Life Speak by Parker J. Palmer ISBN 978-0-7879-4735-4
- Lay People in the Church: A Study for a Theology of the Laity by Yves M.J. Congar, O.P. Translated by Donald Attwater 1959
- Luther on Vocation by Gustaf Wingren 1957
- God at Work: Your Christian Vocation in All of Life by Gene Edward Veith, Jr. ISBN 1-58134-403-1
See also 
- Effectual calling
- Religious calling
- Trade (occupation)
- Vocational discernment in the Catholic Church
- Vocational education
- Richard A. Muller, Dictionary of Latin and Greek Theological Terms: Drawn Principally from Protestant Scholastic Theology (Grand Rapids, Michigan: Baker Book House Company, 1985), s.v. “vocation.”
- The OED records effectively identical uses of "call" in English back to c.1300: OED, "Call", 6 "To nominate by a personal "call" or summons (to special service or office);esp. by Divine authority..."
- Pope John Paul II, Familiaris Consortio, 11.4 
- Gustaf Wintergreen, Luther on Vocation
- David L. Jeffrey, A Dictionary of biblical tradition in English literature, Wm. B. Eerdmans Publishing, 1992, ISBN 0-8028-3634-8, ISBN 978-0-8028-3634-2, Google books See also Max Weber, The Protestant Ethic and the Spirit of Capitalism, trans. Alcott Parsons, Ch.3, p. 79 & note 1.
- Kenneth G. Appold. Abraham Calov's doctrine of vocatio in its systematic context, p. 125 and generally, Mohr Siebeck, 1998, ISBN 3-16-146858-9, ISBN 978-3-16-146858-2, Google books. See also Jeffrey, 815
- Sayers, Dorothy L.. "Why Work?". Retrieved 29 July 2012.
- Leland Ryken, Work and Leisure in Christian Perspective (Portland: Multnomah, 1987), 120.
- John Paul II, Laborem Exercens, § 9.
- Ryken, Work and Leisure, 176.
- Oliver O'Donovan, "Christian Moral Reasoning," in David J. Atkinson and David H. Field (eds), New Dictionary of Christian Ethics and Pastoral Theology (Leicester: IVP, 1995), 123.
- Ryken, Work and Leisure, 147.
- Douglas J. Schuurman; Vocation: Discerning Our Callings in Life (Grand Rapids: Wm B. Eerdmans Publishing Co., 2004) ISBN 080281374 pages 5 & 6
- Center for Applied Research in the Apostolate national, non-profit, Georgetown University affiliated research center that conducts social scientific studies about the Catholic Church.