Louis Berkhof (Introduction to Systematic Theology):

The position of the Church in the world calls for a united testimony. Every Church owes it to other Churches and to the world round about her, to make a public declaration of her teachings. If it is but natural that w desire to know something about the character and convictions of the people to whom we would entrust our material interests, it will certainly be considered highly desirable, and in fact quite essential, that we know exactly where a Church stands, in which we would seek spiritual guidance for ourselves and for our children. Moreover, one Church will have to know where another stands, in order to be able to determine in how far it can correspond, cooperate, and possibly affiliate with such a Church. The Church of Jesus Christ should never seek refuge in camouflage, should not try to hide her identity. And this is exactly what she does in the measure in which she fails to give a clear and unequivocal expression of her faith.