The interpretation timeline
James 2:13 Douay-Rheims

For judgment without mercy to him that hath not done mercy. And mercy exalteth itself above judgment.

A.D. 407 – 1871 8 witnesses

Patristic

before A.D. 750
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“Mercy is the highest art and the shield of those who practice it. It is the friend of God, standing always next to him and freely blessing whatever he wishes. It must not be despised by us. For in its purity it grants great liberty to those who respond to it in kind. It must be shown to those who have quarreled with us, as well as to those who have sinned against us, so great is its power. It breaks chains, dispels darkness, extinguishes fire, kills the worm and takes away the gnashing of teeth. By it the gates of heaven open with the greatest of ease. In short, mercy is a queen which makes men like God.”
Source
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“He who judges without mercy will be judged without mercy. And in this sense only is the "same measure" to be understood, that the mercy which he did not show will not be shown to him, and that the judgment which he makes will be eternal, even though the thing judged cannot be eternal.”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“For he shall have judgment without mercy,.... Strict justice, and no mercy shown him: that hath showed no mercy; to the poor brethren, and distressed members of Christ, but has shown respect of persons to the hurt of the poor, and has despised and oppressed them, instead of relieving and comforting them; so the rich man, that neglected Lazarus at his gates, is refused a drop of water to cool his tongue; and the servant that cruelly insisted on his fellow servant's paying him all he owed, justly incurred the displeasure of his Lord, and was by him delivered to the tormentors; and that servant that beats his fellow servants will be cut asunder, and, have his portion with hypocrites; and such who have seen any of the brethren of Christ hungry, thirsty, naked, sick, and in prison, and have showed no regard for them, will hear, "Go, ye cursed, into everlasting fire": and mercy rejoiceth against judgment; that is merciful men, who have shown mercy to the poor saints, will not be afraid of the awful judgment, but rather rejoice or glory, as the word signifies, in the view of it, since they will obtain mercy at that day, and hear, Come, ye blessed of my Father, &c. Mat 25:34 so the Ethiopic version renders it, he only shall glory in the day of judgment, who hath showed mercy; the Alexandrian copy reads in the imperative, "let mercy glory", &c. and the Syriac version, "be ye exalted by mercy over judgment".”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“For he shall have judgment - He who shows no mercy to man, or, in other words, he who does not exercise himself in works of charity and mercy to his needy fellow creatures, shall receive no mercy at the hand of God; for he hath said, Blessed are the merciful, for they shall obtain mercy. The unmerciful therefore are cursed, and they shall obtain no mercy. Mercy rejoiceth against judgment - These words are variously understood. 1. Mercy, the merciful man, the abstract for the concrete, exults over judgment, that is, he is not afraid of it, having acted according to the law of liberty, Thou shalt love thy neighbor as thyself. 2. Ye shall be exalted by mercy above judgment. 3. For he (God) exalts mercy above judgment. 4. A merciful man rejoices rather in opportunities of showing mercy, than in acting according to strict justice. 5. In the great day, though justice might condemn every man according to the rigour of the law, yet God will cause mercy to triumph over justice in bringing those into his glory who, for his sake, had fed the hungry, clothed the naked, ministered to the sick, and visited the prisoners. See what our Lord says, Matthew 25:31-46. In the MSS. and versions there is a considerable variety of readings on this verse, and some of the senses given above are derived from those readings. The spirit of the saying may be found in another scripture, I will have mercy and not sacrifice - I prefer works of charity and mercy to every thing else, and especially to all acts of worship. The Royal Law, Thou shalt love thy neighbor as thyself, should particularly prevail among men, because of the miserable state to which all are reduced by sin, so that each particularly needs the help of his brother.”
Source
1849
A.D.
1774–1849
“For judgment without mercy, &c. It is an admonition to them to fulfil, as he said before, the royal precepts of the love of God and of our neighbour, which cannot be without being merciful to others. Blessed are the merciful, for they shall obtain mercy. (Matthew v. 7.) — And mercy exalteth itself above judgment. Some understand this as a confirmation of God’s infinite mercies, out of Psalm cxliv. 9. where it is said that his “mercies are over all his works;” that is, though all his perfections be equally infinite, yet he is pleased to deal with sinners rather according to the multitude of his mercies than according to the rigour of his justice. Others expound these words of the mercy which men shew to one another, and that he exhorts them to mercy, as a most powerful means to find mercy; and the merciful works done to others will be beneficial to them, and make them escape when they come to judgment. (Witham) — Similar to this are the words of old Tobias to his son: “Alms deliver from all sin, and from death, and will not suffer the soul to go into darkness. Alms shall be a great confidence before the most high God, to all them that give it.” (Tobias iv. 11, 12.) “Blessed are the merciful,” says our divine Judge, “for they shall obtain mercy.” (Matthew v. 7.) (Calmet) — And the definitive sentence of Christians, at the day of judgment will be favourable or not, as they have complied in life with the calls of charity. [Matthew xxv. 31-46.]”
Source
1863
A.D.
1796–1863
“G. Ka.Tnx.uvx,^Ta,i iKio; Kpta-ice;. V. superexaltat autem misericordia judicium. Probably it may havebeen originally: " Super exultat." With thisreadingit might be rendered : " mercy exulteth over judgment." The meaning of the text seems to be, that the exercise of mercy towards our fellow-man prevails over the justice of God, provoked by our sins.”
Source
1871
A.D.
1871
“The converse of, "Blessed are the merciful, for they shall obtain mercy" (Mat 5:7). Translate, "The judgment (which is coming on all of us) shall be without mercy to him who hath showed no mercy." It shall be such toward every one as every one shall have been [BENGEL]. "Mercy" here corresponds to "love," Jam 2:8. mercy rejoiceth against judgment--Mercy, so far from fearing judgment in the case of its followers, actually glorifieth against it, knowing that it cannot condemn them. Not that their mercy is the ground of their acquittal, but the mercy of God in Christ towards them, producing mercy on their part towards their fellow men, makes them to triumph over judgment, which all in themselves otherwise deserve.”
Source

Undated

date unknown
date
unknown
Glossa Ordinaria Medieval
“But it exalteth above. As in the judgement he who did not show mercy will grieve, so he who did show it will, being rewarded, exult and rejoice.”
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.