This article speaks of "a love for the truth" as an engine for Ecumenism.

If all Christians, Catholics and others, have truth as a beacon and a goal,
we will eventually converge and find unity

The Catholic Church does not have a monopoly on the truth....c.f. Galileo,
Joan of Arc etc.  Sometimes the Catholic Church, like the scribes and Pharisees of old, has suffered from poor vision of the truth

Jesus, please help all Christians, especially Catholics, to have a stronger desire for truth