[Sidenote: _Nature of the theoretical precedence of the practical: historical knowledge._] The knowledge required for the practical act is not that of the artist, nor of the philosopher, or rather, it is these two also, but only in so far as both are to be found as elements co-operating in that ultimate and complete knowledge which is _historical._ If the first be called intuition, the second concept, and the third perception, and the third be looked upon as the result of the two preceding, it will be said that the knowledge required for the practical act is _perceptive._ Hence the common saying that praises the sure eye of the practical man; hence, too, the close bond between historical sense and practical and political sense; hence, too, the justifiable diffidence of those who, unable to grasp effectual reality, hope to attain to it by force of mere syllogisms and abstractions, or believe that they have attained to it, when they have erected an imaginary edifice. They prove by so doing that they can never be practical men, at least in the sphere of action at which they are then aiming. Such knowledge is not of itself the practical act. The historian as such is a contemplative, not a practical man or politician. If that spark which is volition, do not spring forth, the material of knowledge does not catch fire and is not transformed into the material of the practical. But that knowledge is the condition, and if the condition be not the conditioned, yet one cannot have the conditioned without the condition. In this last signification, it is true that action is knowledge, will, and wisdom, that is to say, in the sense that willing and acting presuppose knowledge and wisdom. In this sense, and considered solely in the stage of the cognoscitive investigation which will form the base of action, the deliberation is a theoretical fact. The customary expressions of logical, rational, judicious actions, are metaphors, because action may be weak or energetic, coherent or incoherent; but it will not have those predicates which are proper to theoretical acts that precede actions, on which the metaphors aforesaid are founded. As are these acts, so originate the practical act, will, and action. We can act in so far as we have knowledge. Volition is not the surrounding world which the spirit perceives; it is a beginning, a new fact. But this fact has its roots in the surrounding world, this beginning is irradiated with the colours of things that man has perceived as a theoretical spirit, before he took action as a practical spirit. [Sidenote: _Its continual changeability._]