"Man, however, judging about his actions through his power of reason, can judge concerning his choice insofar as he can know the nature of the end and of the means to the end, and, likewise, the relation and order of the one to the other.
Man, therefore, is his own cause, not only in moving but also in judging. Hence he has free choice, as one is speaking of the free judgements as to whether to act or not."
St. Thomas Aquinas
