109. According to the difference of the object of the reward, there are two kinds of merit: (a) natural merit, which makes one worthy of a reward that does not exceed the native powers or exigencies of a created being, such as success, prosperity, or other goods that do not constitute the Last End of man (see 20). Thus, we read in scripture of pagans or sinners who were blest with temporal happiness on account of their natural virtues; (b) supernatural merit, which makes one worthy of the beatitude surpassing mere created power that God has prepared for those who serve Him (see 20). It is only this kind of merit that is being considered here; for, since the Last End of man is a supernatural reward (viz, the Beatific Vision of God), it follows that the acts by which he tends to that End must be not only human and moral, but supernaturally meritorious. 110. There are four kinds of supernatural merit: (a) condign merit in the stricter sense, that is merit which arises from justice, and which presupposes no favor on the part of the rewarder. In this sense Christ merited, since even the grace which made His merits supernatural was due to Him as the God-Man; (b) condign merit in the less strict sense, that is merit which arises indeed from justice, but presupposes a favor on the part of the rewarder. In this way the righteous merit before God, since their works confer a right to their own reward, while the grace which enables them to perform their works is a divine favor; (c) congruous merit in the stricter sense, that is merit which arises not from justice (since there is no equality between the work and the reward), but from the fitness of things, because the person who merits is a friend of God. In this way all who are in the state of grace can merit spiritual goods for others; (d) congruous merit in the wide sense, that is merit which arises from the liberality of God, who answers a good work as if it were a prayer. In this way the good works done by sinners can be said to merit conversion for them. 111. The second kind of merit mentioned above--i.e., condign merit in the less strict sense--is that with which we are chiefly concerned here, since it is the kind of merit that must be found in human acts in order that they may lead man to a supernatural reward. A fuller treatment of merit is found in Dogmatic Theology in the Question on Grace. 112. The conditions requisite for the kind of merit now in question are: (a) that the work done be human, that is, free, morally good, and supernatural (i.e., proceeding from sanctifying grace and divine charity); (b) that the one who merits be in the wayfaring state (i.e., that he have not already passed to final reward or punishment), and that he be in the state of grace; (c) that God has promised a reward for the work done. From the statements made above, it follows that all the human and morally good works of those who are in the state of grace possess condign merit.