And will be a Father unto you, and ye shall be my sons and daughters, saith the Lord Almighty.

People's New Testament

6:18 And I will be a Father unto you. Quoted from Jer 31:1,9 Isa 43:6, and other passages. It is a free combination of the spirit of several passages. The two passages teach that it is the Divine will that his worshipers should be separate from the world; that if they are thus separate he will receive them, and will accept them as his own children. Compare Ro 12:2 Jas 1:27.

Wesley's Notes

6:18 And ye shall be to me for sons and for daughters, saith the Lord Almighty - The promise made to Solomon, 1Chr 28:6, is here applied to all believers; as the promise made particularly to Joshua is applied to them, Heb 13:5. Who can express the worth, who can conceive the dignity, of this divine adoption? Yet it belongs to all who believe the gospel, who have faith in Christ. They have access to the Almighty; such free and welcome access, as a beloved child to an indulgent father. To him they may fly for aid in every difficulty, and from him obtain a supply in all their wants. Isaiah 43:6.

Jamieson-Fausset-Brown Bible Commentary

18. Translate, "I will be to you in the relation of a Father, and ye shall be to me in the relation of sons and daughters." This is a still more endearing relation than (2Co 6:16), "I will be their God, and they . My people." Compare the promise to Solomon (1Ch 28:6; Isa 43:6; Re 21:3, 7; Jer 31:1, 9).

Lord Almighty-The Lord the Universal Ruler: nowhere else found but in Revelation. The greatness of the Promiser enhances the greatness of the promises.

Matthew Henry's Concise Commentary

6:11-18 It is wrong for believers to join with the wicked and profane. The word unbeliever applies to all destitute of true faith. True pastors will caution their beloved children in the gospel, not to be unequally yoked. The fatal effects of neglecting Scripture precepts as to marriages clearly appear. Instead of a help meet, the union brings a snare. Those whose cross it is to be unequally united, without their wilful fault, may expect consolation under it; but when believers enter into such unions, against the express warnings of God's word, they must expect must distress. The caution also extends to common conversation. We should not join in friendship and acquaintance with wicked men and unbelievers. Though we cannot wholly avoid seeing and hearing, and being with such, yet we should never choose them for friends. We must not defile ourselves by converse with those who defile themselves with sin. Come out from the workers of iniquity, and separate from their vain and sinful pleasures and pursuits; from all conformity to the corruptions of this present evil world. If it be an envied privilege to be the son or daughter of an earthly prince, who can express the dignity and happiness of being sons and daughters of the Almighty?