The Use of 'Thee' and 'Thou' in the Bible and in Prayer

For hundreds of years English-speaking people in all parts of the world have been accustomed to using thee and thou in prayer to God in much the same way as these pronouns are used in the older versions of the Bible, in particular the King James (or Authorized) Version. Yet in the last forty years there has been a movement away from the use of these distinct pronouns in prayer. 

Familiar Conversation with God: Calvin on Prayer Calvin on Prayer

John Calvin understood prayer to be the communion of men with God by which, having entered the heavenly sanctuary, they appeal to him in person concerning his promises, in order to experience that what they believed was not in vain. This article discusses the purposes and method of prayer, rules of prayer, Trinitarian focus of prayer, and perseverance in prayer.