We are here taught that something forbidden was necessary in man's experience on earth. Man had been endowed with free agency, but unless there had been something not lawful to do, there could not have been freedom of choice. Man could have willed only that which was lawful, there being nothing unlawful. Kant puts this thought fairly well when he says that to act in response to duty is to give a law to oneself, and that is to be autonomous, or free. Hence I say, the very prohibition made man free, as long as he was at liberty to choose between obedience and disobedience, with a clear understanding of the consequences.