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In page Second Vatican Council:

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Observers (§18) . An important innovation was the invitation by Pope John to Orthodox and Protestant Churches to send observers to the council. Eventually 21 denominations or bodies such as the World Council of Churches were represented.[9][2][10][a] The observers were entitled to sit in on all general assemblies (but not the commissions) and they mingled with the Council Fathers during the breaks and let them know their reactions to speeches or to schemas. Pope Paul VI welcomed their participation "with gratitude and respect".[12]: Paragraph 112  Their presence helped to break down centuries of mistrust.[citation needed]