1 John 3:10

“In this the children of God are manifest, &c.] By regenerating grace, and not sinning, in the sense before explained, in consequence of it: adoption is an act of God's grace and sovereign will; it is secret in his own heart, and is secured in divine predestination, and in the covenant of grace, and is antecedent to regeneration: regeneration and faith do not make men the children of God, but manifest them to be so; adoption makes them the children of God, and entitles them to the inheritance; regeneration gives them the nature of the children of God, and makes them meet for it, and manifests their right unto it; not to the men of the world, but to themselves and other saints: and the…”

“children of the devil--(See on Jo1 3:8; Act 13:10). There is no middle class between the children of God and the children of the devil. doeth not righteousness--Contrast Jo1 2:29. he that loveth not his brother-- (Jo1 4:8); a particular instance of that love which is the sum and fulfilment of all righteousness, and the token (not loud professions, or even seemingly good works) that distinguishes God's children from the devil's.”

“In this the children of God are manifest ... - That is, this furnishes a test of their true character. The test is found in doing righteousness, and in the love of the brethren. The former he had illustrated; the latter he now proceeds to illustrate. The general idea is, that if a person is not truly a righteous person, and does not love the brethren, he cannot be a child of God. Perhaps by the phrase in this, using a pronoun in the singular number, he means to intimate that an important part of righteousness consists in brotherly love. Whosoever doeth not righteousness, is not of God - In 1 John 3:7, he had said that “he that doeth righteousness is of God.” If that is true, then what he…”

“Neither he that loveth not his brother - Here is the transition from the general proposition to one particular. 1 John 3:12”

“the children of God: Jo1 5:2; Luk 6:35; Rom 8:16, Rom 8:17; Eph 5:1 and: Mat 13:38; Joh 8:44; Act 13:10 whosoever: Jo1 3:7, Jo1 3:8, Jo1 2:29 is: Jo1 4:3, Jo1 4:4, Jo1 4:6, Jo1 5:19; Joh 8:47; Jo3 1:11 neither: Jo1 3:14, Jo1 3:15, Jo1 2:9, Jo1 2:10, Jo1 4:8, Jo1 4:21 1 John 3:11”