I have tried to compare Aquinas Thomas and Pandit Dianand Sarswati [Sarsuti] on several issues and found that Saint Thomas had a better knowledge on various subjects then the Pandit Dianand. Below I compare the concepts of both on Divine Justice and Mercy. A part of Scriptural discussion Thomas usually deals the problem more deeply and beautifully.
5. Is God Just as well as Merciful A.~ Yes, he is both. Q. These two attributes are opposed to each other, since Justice consists in giving a person the just amount of pleasure or pain - neither more nor less - according to the nature of his deeds, while mercy consisted in letting the offender go unpunished. How could He be both merciful and just at the same time? A.- Justice and mercy differ only in name. The object served by justice is the same as accomplished by mercy. Now the object of infliction punishment through justice is to prevent people from committing crimes and thereby enable them to be freed from pain and misery. What is the object of mercy but to rid people of misery? Your definitions of justice and mercy are not correct, because the infliction of just punishment in exact accordance with the amount of crime is called justice. If the offender be not punished, mercy will be destroyed, for suffering one such criminal, a a robber, to go unpunished amounts to giving pain to thousands of righteous and law-abiding people. What mercy can ther be, the, in allowing one man to go unpunished and making others suffer? It will be an act of mercy indeed to that robber to keep him in prison and thereby prevent him from further commission of crimes. It will also be an act of mercy to thousands of other people to rid them of that robber or dacoit by putting him to death of keeping him in prison. Q. What is then the object of having two terms - mercy and justice- both having the same meaning? It is useless to have two terms, it would have been far better to have only one. This shows that they do not mean the same. A.~ Is not an idea expressed by more than one word, and cannot one word be expressive of more than one idea? Q. Yes, it is so. A.- Why did you doubt it then? Q.Because we hear it said in the world. A.- We hear both true and false statements being made in this world, but it is our duty to discriminate between them after due reflection. Behold the infinite mercy of God that He has created all things in this world for the good of all, and given them all freely! What mercy can be greater than this? On the other hand, the inequality in the condition of men - some are in a state of misery - while others in a state of happiness - is a clear proof of the operation