“The source of man's rights is not divine law or a congressional law, but the law of identity. A is A ___ and man is man. Rights are conditions of existence required by man's nature for his proper survival. If man is to live on earth, it is right for him to use his mind, it is right to act on his own free judgment, it is right to work for his values and to keep the product for his work. If life on earth is his purpose, he has a right to live as a rational being: nature forbids him the irrational”