Marks of the church according to Hendrikus Berkhof, Christian Faith

(i)         instruction (i.e., catechetics)

(ii)        the washing

(iii)       the sermon

(iv)       the discussion

(v)        the meal

(vi)       the diaconate

(vii)      the meeting

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(viii)     office

(ix)       church polity (church order)

(Berkhof maintains that these lattermost two serve to make the other seven operative.)