LVI. Although so many pre-eminent merits indisputably assigned to him the distinction we have pointed out, yet the Divine wisdom decided to subject his constancy to various trials, with the view of making manifest to the world the excellence of that virtuous character, and the justice which dictated the choice. In the continual antagonism between the material and spiritual interests involved in the events of his agitated life, he had opportunities to display the noblest firmness in causing the latter to prevail. Involuntary peregrinations, conflicts with foreign potentates, domestic discords, dangers, hazards, hopes deferred, and promises well nigh forgotten, became to him so many occasions for the exercise of the highest virtues: and last, the holy resignation with which he prepared to immolate his beloved son, thinking thereby to respond to a Divine bidding, raised his glory to an unapproachable summit. If the other deeds of his edifying piety caused him to be appointed a herald of the true religion, this last heroic act brought down upon him the greatest blessing, in the shape of a promise, that even to his remotest posterity would be extended the mission of jealously preserving the revealed truths, and effectually cooperating in their propagation, so that through that posterity would be _blessed all the families of the earth._ LVII. Abraham's vocation marks a luminous and highly interesting epoch in the history of humanity. It was the commencement of the execution of that plan of education of mankind, which, conceived since the beginning in the Increate Mind, came by means extraordinary, yet consistent with the natural course of earthly events, to diffuse itself gradually and to acquire a progressive force among the various ramifications of the human family. In that vocation we perceive the first threads of a wonderful tissue of events, as well in the physical as in the moral world, which went on preparing a slow but always progressive development of the human intelligence, and will go on to produce ultimately the full final accomplishment of the same primitive plan, so grandly conceived. In fact, in the very act of electing this patriarch, God revealed the ultimate object of the election by saying, that He chose him, in order that he might transmit to his latest posterity the obligation--which was to become characteristic of it--of exercising and promoting CHARITY and JUSTICE, the two chief columns on which rests the edifice of human perfectibility, two conditions indispensable to the fulfilment of the Divine idea, and therefore called _ways of the Eternal_.