The Catholic theological tradition is not a series of historically contiguous but different theologies; it is a continuous effort in a uniform line. A twentieth-century theologian can go back to the thirteenth or sixteenth and not be in an unknown, strange world. He is quite at home, because it is the very house he is living in today. There is central heating now and electricity, but the fireplaces have not been removed. There are elevators, but the magnificent stairs of the older time are still there. Even the moat can still be seen, though today it is used for flower beds, and the drawbridge is always down.... The Protestant theological house does not follow such a plan; it is really a rambling complex of buildings. At any moment it obeys the dictates of the tastes of the time, but one can see in the whole that there were once other structures where present ones now stand. The older parts have been torn down, though elements thereof were employed in the present erections.