This equation for an instinct, based upon an analysis of the working of the sex instinct, is the model for the analysis of all instincts, and therefore of all the compounded instincts that all human behaviour may be resolved into.

Thou 'plus' will must be the 'antithesis', but the equation of Thou with I, by means of a free act, negativing the sameness in order to establish the equality, is the true definition of conscience.

The personal equation is always a prominent factor in human ambitions, and nowhere was it more emphatically dominant than in the mutual jealousies of the men of Florence.