This tendency of mankind to do, in general, this year what it did last, in spite of changes in some one department of life, — such as substituting a … - James Harvey Robinson

During the tenth and eleventh centuries the rule of the Church prohibiting the clergy from marrying appears to have been widely and publicly neglected in Italy, Germany, France, and England. To the stricter critics of the time this appeared a terrible degradation of the clergy, who, they felt, should be unencumbered by family cares and wholly devoted to the service of God. The question, too, had another side. It was obvious that the property of the Church would soon be dispersed if the clergy were allowed to marry, since they would wish to provide for their children. Just as the feudal tenures had become hereditary, so the church lands would become hereditary unless the clergy were forced to remain unmarried.

It is impossible to divide the past into distinct, clearly defined periods and prove that one age ended and another began in a particular year, such as 476, or 1453, or 1789. Men do not and cannot change their habits and ways of doing things all at once, no matter what happens.

It gives one something of a shock, indeed, to consider what a very small part of our guiding convictions are in any way connected with our personal experience. The date of our own birth is quite as strictly historical a fact as that of Artaphernes or of Innocent III; we are forced to a helpless reliance upon the evidence of others for both events. So it comes about that our personal recollections insensibly merge into history in the ordinary sense of the word. History, from this point of view, may be regarded as an artificial extension and broadening of our memories and may be used to overcome the natural bewilderment of all unfamiliar situations. Could we suddenly be endowed with a Godlike and exhaustive knowledge of the whole history of mankind, far more complete than the combined knowledge of all the histories ever written, we should gain forthwith a Godlike appreciation of the world in which we live, and a Godlike insight into the evils which mankind now suffers, as well as into the most promising methods for alleviating them, not because the past would furnish precedents of conduct, but because our conduct would be based upon a perfect comprehension of existing conditions founded upon a perfect knowledge of the past.