In his first encyclical Pius had already touched on the question of Catholic social action. In his _motu proprio_ of December 1903 he spoke still more definitely on the subject. Born and brought up in the midst of the people, he could thoroughly understand their needs. He foresaw also the dangers of rash and imprudent action which might rely too strongly on popular effort and influence. It was not the movement towards social reform itself which stood in need of being checked, but the extravagances of some over-enthusiastic reformers. "Christian democracy," he declared, "must have for its basis the principles of Catholic faith and morals, and must be free of political parties." His great predecessor Leo XIII, having luminously traced the rules of Christian popular action in his famous encyclicals (continued Pius), his own desire was that those prudent rules should be exactly and fully observed. He had therefore decided to collect them in an abridged form that they might be for all Catholics a constant rule of conduct. After having laid down man's right to the use and permanent ownership of property, he passed on to the obligations of justice between masters and men, and the utility of aid societies and trades unions. Christian democracy, he maintained, had for its special aim the solution of the difficulties between labour and capital, but in order to do this effectually it must be based on the principles of the Catholic faith and morality; it must not be made use of for party purposes; it must be a beneficent activity for the people founded on the natural law and the precepts of the Gospel. Catholic writers, when upholding the cause of the people and the poor, were to beware of using language calculated to inspire ill-feeling between classes. Here, as in other matters, obedience to the laws of God and of the Church was to be the means to the solution of the many difficulties which existed. "Godliness is profitable to all things," he had said in his first encyclical, "and when this is whole and vigorous, in very truth the people shall sit in the beauty of peace."