The individual may stand upon his constitutional rights as a citizen. He is entitled to carry on his private business in his own way. His power to contract is unlimited. He owes no duty to the state or to his neighbors to divulge his business, or to open his doors to an investigation, so far as it may tend to criminate him. He owes no such duty to the state, since he receives nothing therefrom, beyond the protection of his life and property .... He owes nothing to the public so long as he does not trespass upon their rights.