Section 4. Every man may freely write, speak and publish his opinions on all subjects, being responsible for the abuse of that privilege. In all civil and criminal trials for libel the truth may be given in evidence, and shall be a sufficient defense when the matter is published with good motives and for justifiable ends; and the jury shall have the same power of giving a general verdict as in other cases; and in all indictments or informations for libels the jury shall have the right to determine the law and the facts under the direction of the court as in other cases.