In proof of this I have but to refer to the principle on which, as stated in the first chapter, the whole system of Positivism is based; the preponderance of affection in our nature. Such a principle is of itself an appeal to women to associate themselves with the system, as one of its essential elements. In Catholicism, their co-operation, though valuable, was not of primary importance, because Catholicism claimed a divine origin independent of their assistance. But to Positivism they are indispensable, as being the purest and simplest embodiment of its fundamental principle. It is not merely in the Family that their influence will be required. Their duty will often be to call philosophers and people back to that unity of purpose which originated in the first place with themselves, and which each of the other elements is often disposed to violate. All true philosophers will no doubt accept and be profoundly influenced by the conviction, that in all subjects of thought the social point of view should be logically and scientifically preponderant. They will consequently admit the truth that the Heart takes precedence of the Understanding. Still they require some more direct incentive to universal Love than these convictions can supply. Knowing, as they do, how slight is the practical result of purely intellectual considerations, they will welcome so precious an incentive, were it only in the interest of their own mission. I recognized its necessity myself, when I wrote on the 11th of March, 1846, to her who, in spite of death, will always remain my constant companion[7]: ‘I was incomplete as a philosopher, until the experience of deep and pure passion has given me fuller insight into the emotional side of human nature’. Strong affection exercises a marvellous influence upon mental effort. It elevates the intellect at once to the only point of view which is really universal. Doubtless, the method of pure science leads up to it also; but only by a long and toilsome process, which exhausts the power of thought, and leaves little energy for following out the new results to which this great principle gives rise. The stimulation of affection under feminine influence is necessary, therefore, for the acceptance of Positivism, not merely in those classes for whom a long preliminary course of scientific study would be impossible. It is equally necessary for the systematic teachers of Positivism, in whom it checks the tendency, which is encouraged by habits of abstract speculation, to deviate into useless digressions; these being always easier to prosecute than researches of real value. [Superiority of the new spiritual power to the old. Self-regarding tendencies of Catholic doctrine]