HKB
"immediately leaving their nets, followed Him." Here Chrysostom says (Hom. xiv in Matth.): "Such obedience as this does Christ require of us, that we delay not even for a moment."
I answer that, Long deliberation and the advice of many are required in great matters of doubt, as the Philosopher says (Ethic. iii, 3); while advice is unnecessary in matters that are certain and fixed. Now with regard to entering religion three points may be considered. First, the entrance itself into religion, considered by itself; and thus it is certain that entrance into religion is a greater good, and to doubt about this is to disparage Christ Who gave this counsel. Hence Augustine says (De Verb. Dom., Serm. c, 2): "The East," that is Christ, "calleth thee, and thou turnest to the West," namely mortal and fallible man. Secondly, the entrance into religion may be considered in relation to the strength of the person who intends to enter. And here again there is no room for doubt about the entrance to religion, since those who enter religion trust not to be able to stay by their own power, but by the assistance of the divine power, according to Isa. 40:31, "They that hope in the Lord shall renew their strength, they shall take wings as eagles, they shall run and not be weary, they shall walk and not faint." Yet if there be some special obstacle (such as bodily weakness, a burden of debts, or the like) in such cases a man must deliberate and take counsel with such as are likely to help and not hinder him. Hence it is written (Ecclus. 37:12): "Treat with a man without religion concerning holiness [*The Douay version supplies the negative: 'Treat not . . . nor with . . .'], with an unjust man concerning justice," meaning that one should not do so, wherefore the text goes on (Ecclus. 37:14, 15), "Give no heed to these in any matter of counsel, but be continually with a holy man." In these matters, however, one should not take long deliberation. Wherefore Jerome says (Ep. and Paulin. liii): "Hasten, I pray thee, cut off rather than loosen the rope that holds the boat to the shore." Thirdly, we may consider the way of entering religion, and which order one ought to enter, and about such matters also one may take counsel of those who will not stand in one's way.
Reply Obj. 1: The saying: "Try the spirits, if they be of God," applies to matters admitting of doubt whether the spirits be of God; thus those who are already in religion may doubt whether he who offers himself to religion be led by the spirit of God, or be moved by hypocrisy. Wherefore they must try the postulant whether he be moved by the divine spirit. But for him who seeks to enter religion there can be no doubt but that the purpose of entering religion to which his heart has given birth is from the spirit of God, for it is His spirit "that leads" man "into the land of uprightness" (Ps. 142:10).
Nor does this prove that it is not of God that some turn back; since not all that is of God is incorruptible: else corruptible creatures would not be of God, as the Manicheans hold, nor could some who have grace from God lose it, which is also heretical. But God's "counsel" whereby He makes even things corruptible and changeable, is imperishable according to Isa. 46:10, "My counsel shall stand and all My will shall be done." Hence the purpose of entering religion needs not to be tried whether it be of God, because "it requires no further demonstration," as a gloss says on 1 Thess. 5:21, "Prove all things."