Individuality is the incalculable factor in life, and it is one, too, that must be fully allowed for, if one would proceed as harmoniously as possible among the unseen brambles and pitfalls that may beset his onward pathway. A very large proportion of the discords of life arise from the failure to take into consideration the special qualities in their special grouping that determine the person with whom one has to do,--qualities which are, practically, unalterable, and must simply be accepted and borne with as best one may. There is the person, for instance, who is always and invariably behind time in every movement of his life. He leaves undone the things that ought to be done, until there is little use in doing them at all. He exhausts the patience and excites the irritability of his friend, who is, by nature, prompt and always up with the hour. There is the person who, from some latent cause in his character, always manages badly; who reduces all his own affairs to confusion; who contrives to waste more money, time, and energy than industry and energy can produce; whose normal condition is a crisis of disaster, and who, if extricated from this seventy times seven, will contrive to fall into it again. All these, and a thousand variations on characters of this type, we see around us, or within ourselves, constantly, and a liberal proportion of the trial or discord incident to family life, or to friendship and companionship, is simply in constantly demanding of another that which he cannot give, which he does not possess. To ask of the habitual procrastinator that he shall be prompt; or of the defective manager that he shall keep his affairs in order and make the most and the best out of his possessions, is totally useless. In the evolutionary progress of life, he will probably, sometime and somewhere, learn wisdom and do better; but habit and temperament are not liable to meet a sea change into something new and strange all in the flash of a moment, and it is worse than useless to demand this, or to be irritated, or impatient, or even too sorrowful, because of this fact. There are things that cannot be cured,--at least, not immediately. Therefore they must be endured. When one once makes up his mind to the acceptance of this theory it is astonishing to see how it simplifies the problem. The philosophy is merely to do one's own part, but not to make any superhuman effort to do the other person's part also. Let it go. There is no use in making a _casus belli_ of the matter. Nothing is ever helped by irritation over it,--even the irritation of generosity and love, which seeks only the good of the other.