"The grace of one soul"

"A thing is called great in two ways: first, in an absolute quantity, and thus the gift of glory is greater than the gift of grace that sanctifies the ungodly; and in this respect the glorification of the just is greater than the justification of the ungodly. Secondly, a thing may be said to be great in proportionate quantity, and thus the gift of grace that justifies the ungodly is greater than the gift of glory that beatifies the just, for the gift of grace exceeds the worthiness of the ungodly, who are worthy of punishment, more than the gift of glory exceeds the worthiness of the just, who by the fact of their justification are worthy of glory. Hence Augustine says: "Let him that can, judge whether it is greater to create the angels just, than to justify the ungodly. Certainly, if they both betoken equal power, one betokens greater mercy."

"...The good of the grace of one soul is greater than the good of the nature of the whole universe."

 
~St. Thomas Aquinas: S.T. I-II, q. 113, a. 9.