(b) The proximate means of communicating a knowledge of faith is the declaration of the faith to non-Catholics who are willing to hear, through missionaries sent to foreign countries, Catholic literature given to those who are well-disposed, invitations to Catholic instructions, public lectures on the faith, the question box at missions, etc. (see Canons 1350, 1351). cooperation with Catholic schools and publications, foreign and home missions, etc., makes one a sharer in the work of the apostles who are bearing the burden of the day. 916. The means appointed by the Church for communicating the doctrines of faith to Catholics are as follows: (a) For the Laity.--From childhood religious and moral training should have the first place in education, and should not be confined to elementary schools, but continued in secondary and higher schools (Canons 1372, 1373). Pastors are obliged to give catechetical instructions, and parents must see that their children attend them (Canons 1329-1336). (b) For the Clergy.--Aspirants to the priesthood must follow the courses prescribed for preparatory and higher seminaries or houses of studies (Canons 1352-1371, 587-592), and no one is admitted to Orders who has not passed canonical examinations (Canons 996, 997, 389, Sec.2). The faculties for hearing confessions and preaching also presuppose examinations (Canons 1340, 877), and no one is to be promoted to ecclesiastical offices, such as that of parish priest, unless he is judged competent in knowledge (Canons 459, 149). The clergy are encouraged to take university studies and degrees (Canons 1380, 1378). 917. A person applies himself sufficiently to the understanding of the teaching of faith when he takes care that, both extensively or in quantity and intensively or in quality, his knowledge is all that is required of him. (a) Extensively, the knowledge should be such as to include at least all those truths that have to be known, because explicit faith in them is necessary; (b) intensively, the knowledge should be more or less perfect according to the greater or less intelligence, rank or responsibility of the person. 918. The truths that have to be known by all capable of the knowledge are as follows: (a) All must know, from the necessity of the case (necessity of means), that they have a supernatural destiny and that Christ is the Way that leads to it; for one cannot tend to a destination, if one is unaware of its existence and of the road that will bring one there. Hence, all must know the four basic truths: God our Last End, the Trinity, the Incarnation, God the Remunerator (see 787).