Prayer has been an essential part of Christianity since its earliest days. Prayer is an integral element of the Christian faith and permeates all forms of Christian worship. Prayer in Christianity is the tradition of communicating with God, either in God's fullness or as one of the persons of the Trinity. In the early Church worship was inseparable from doctrine as reflected in the statement: lex orandi, lex credendi, i.e. the law of belief is the law of prayer. The Lord's Prayer was an essential element of the meetings of early Christians, and over time a variety of Christian prayer emerged.