The 4th Assembly at Uppsala, Sweden, in 1968, bore further testimony to the expanding membership of the Council, as well as the fresh breezes of Vatican II that brought Catholic observers to participate in the meeting and discuss further opportunities for cooperation. Appropriately, the Uppsala theme was "Behold, I Make All Things New". Sections were organized under the headings:
The Holy Spirit and the catholicity of the church.
Renewal in mission.
World economic and social development.
Towards justice and peace in international affairs.
Towards new styles of living.