Among the manifold currents in the spiritual life of humanity there is one which we must now trace, and which we may call the elimination of the concept of purpose from spheres to which it does not belong. Adaptation to purpose is a special kind of sequence of phenomena. Such adaptation is genuinely real only when, in contrast to the relation of cause and effect in which the antecedent event determines the subsequent, the subsequent event determines the antecedent. This is possible only in the sphere of human actions. Man performs actions which he first presents to himself in idea, and he allows himself to be determined to action by this idea. The consequent, i.e., the action, influences by means of the idea the antecedent, i.e., the human agent. If the sequence is to have purposive character, it is absolutely necessary to have this circuitous process through human ideas. In the process which we can analyse into cause and effect, we must distinguish percept from concept. The percept of the cause precedes the percept of the effect. Cause and effect would simply stand side by side in our consciousness, if we were not able to connect them with one another through the corresponding concepts. The percept of the effect must always be consequent upon the percept of the cause. If the effect is to have a real influence upon the cause, it can do so only by means of the conceptual factor. For the perceptual factor of the effect simply does not exist prior to the perceptual factor of the cause. Whoever maintains that the flower is the purpose of the root, i.e., that the former determines the latter, can make good this assertion only concerning that factor in the flower which his thought reveals in it. The perceptual factor of the flower is not yet in existence at the time when the root originates.