Leonardo virtually announced the birth of the method of modern science when he said that true knowledge begins with opinion.

Platon bir defasında köleyi başkalarının amaçlarını gerçekleştiren kişi olarak tanımlamıştır ve daha önce belirttiğimiz üzere kendi arzularının tutsağı olmuş bir kişi de aslında bir köledir.

Individuality, conceived as a temporal development involves uncertainty, indeterminacy, or contingency. Individuality is the source of whatever is unpredictable in the world....genuine time, if it exists as anything else except the measure of motions in space, is all one with the existence of individuals as individuals, with the creative, with the occurrence of unpredictable novelties. Everything that can be said contrary to this conclusion is but a reminder that an individual may lose his individuality, for individuals become imprisoned in routine and fall to the level of mechanisms. Genuine time then ceases to be an integral element of their being. Our behavior becomes predictable, because it is but an external rearrangement of what went before....surrender of individuality by the many to someone who is taken to be a superindividual explains the retrograde movement of society. Dictatorships and totalitarian states, and belief in the inevitability of this or that result coming to pass are, strange as it may sound, ways of denying the reality of time and the creativeness of the individual....the artist in realizing his own individuality reveals potentialities hitherto unrealized. The revelation is the inspiration of other individuals to make the potentialities real, for it is not sheer revolt against things as they are which stirs human endeavor to its depth, but vision of what might be and is not. Subordination of the artists to any special cause no matter how worthy does violence not only to the artist but to the living source of a new and better future.