History should be written from the original sources of friend and foe, in the spirit of truth and love, "sine ira et studio," "with malice towards none, and charity for all," in clear, fresh, vigorous style, under the guidance of the twin parables of the mustard seed and leaven, as a book of life for instruction, correction, encouragement, as the best exposition and vindication of Christianity. The great and good Neander, "the father of Church History" first an Israelite without guile hoping for the Messiah, then a Platonist longing for the realization of his ideal of righteousness, last a Christian in head and heart made such a history his life-work, but before reaching the Reformation he was interrupted by sickness, and said to his faithful sister: "Hannchen, I am weary; let us go home; good night!" And thus he fell gently asleep, like a child, to awake in the land where all problems of history are solved.
When, after a long interruption caused by a change of professional duties and literary labors, I returned to the favorite studies of my youth, I felt the necessity, before continuing the History to more recent times, of subjecting the first volume to a thorough revision, in order to bring it up to the present state of investigation. We live in a restless and stirring age of discovery, criticism, and reconstruction. During the thirty years which have elapsed since the publication of my separate "History of the Apostolic Church," there has been an incessant activity in this field, not only in Germany, the great workshopof critical research, but in all other Protestant countries. Almost every inch of ground has been disputed and defended with a degree of learning, acumen, and skill such as were never spent before on the solution of historical problems.