“The best wrestler,” he would say, “is not he who has learned thoroughly all the tricks and twists of the art, which are seldom met with in actual wrestling, but he who has well and carefully trained himself in one or two of them, and watches keenly for an opportunity of practising them. It does not matter how many of them he knows, if he knows enough to give him the victory; and so in this subject of ours there are many points of interest, but few of importance. You need not know what is the system of the ocean tides, why each seventh year leaves its mark upon the human body, why the more distant parts of a long portico do not keep their true proportion, but seem to approach one another until at last the spaces between the columns disappear, how it can be that twins are conceived separately, though they are born together, whether both result from one, or each from a separate act, why those whose birth was the same should have such different fates in life, and dwell at the greatest possible distance from one another, although they were born touching one another; it will not do you much harm to pass over matters which we are not permitted to know, and which we should not profit by knowing. Truths so obscure may be neglected with impunity.