The real challenge of ecumenism is to share a common life; that is, to do together whatever we do not need to do apart.
On 15th August 2022, it will be 70 years since the start of the Third Faith and Order Conference in Lund, Sweden (1952). The important Lund principle for ecumenical relationships was articulated at that conference:
“Should not our Churches ask themselves whether they are showing sufficient eagerness to enter into conversation with other Churches, and whether they should not act together in all matters except those in which deep differences of conviction compel them to act separately? “
Instead of doing ecumenical things, Christians and churches should try to do things ecumenically, in particular, to do things together which are already a part of their normal life, i.e. to share a common life.