I answer that, All agree in reckoning three dowries of the soul, in different ways however. For some say that the three dowries of the soul are vision, love, and fruition. others reckon them to be vision, comprehension, and fruition; others, vision, delight, and comprehension. However, all these reckonings come to the same, and their number is assigned in the same way. For it has been said (Article [2]) that a dowry is something inherent to the soul, and directing it to the operation in which beatitude consists. Now two things are requisite in this operation: its essence which is vision, and its perfection which is delight: since beatitude must needs be a perfect operation. Again, a vision is delightful in two ways: first, on the part of the object, by reason of the thing seen being delightful; secondly, on the part of the vision, by reason of the seeing itself being delightful, even as we delight in knowing evil things, although the evil things themselves delight us not. And since this operation wherein ultimate beatitude consists must needs be most perfect, this vision must needs be delightful in both ways. Now in order that this vision be delightful on the part of the vision, it needs to be made connatural to the seer by means of a habit; while for it to be delightful on the part of the visible object, two things are necessary, namely that the visible object be suitable, and that it be united to the seer. Accordingly for the vision to be delightful on its own part a habit is required to elicit the vision, and thus we have one dowry, which all call vision. But on the part of the visible object two things are necessary. First, suitableness, which regards the affections---and in this respect some reckon love as a dowry, others fruition (in so far as fruition regards the affective part) since what we love most we deem most suitable. Secondly, union is required on the part of the visible object, and thus some reckon comprehension, which is nothing else than to have God present and to hold Him within ourself [*Cf. FS, Question [4], Article [3]]; while others reckon fruition, not of hope, which is ours while on the way, but of possession [*Literally "of the reality: non spei . . . sed rei"] which is in heaven.
Thus the three dowries correspond to the three theological virtues, namely vision to faith, comprehension (or fruition in one sense) to hope, and fruition (or delight according to another reckoning to charity). For perfect fruition such as will be had in heaven includes delight and comprehension, for which reason some take it for the one, and some for the other.
Others, however, ascribe these three dowries to the three powers of the soul, namely vision to the rational, delight to the concupiscible, and fruition to the irascible, seeing that this fruition is acquired by a victory. But this is not said properly, because the irascible and concupiscible powers are not in the intellective but in the sensitive part, whereas the dowries of the soul are assigned to the mind.