17 Or “to the praise of his glorious grace.” Many translations translate δόξης τῆς χάριτος αὐτοῦ (doxēs tēs charitos autou, literally “of the glory of his grace”) with τῆς χάριτος as an attributed genitive (cf., e.g., , , ESV). The translation above has retained a literal rendering in order to make clear the relationship of this phrase to the other two similar phrases in v. 12 and 14, which affect the way one divides the material in the passage.
18 Grk “the beloved.” The term ἠγαπημένῳ (ēgapēmenō) means “beloved,” but often bears connotations of “only beloved” in an exclusive sense. “His dearly loved Son” picks up this connotation. God’s grace can be poured out on believers only because of what Christ has done for them. Hence, he bestows his grace on us because we are in his dearly loved Son.

In other versions

to the praise of his glorious grace, with which he has blessed us in the Beloved.

to the praise of his glorious grace, which he has freely given us in the One he loves.

to the praise of his glorious grace that he lavished on us in the Beloved One.

So we praise God for the glorious grace he has poured out on us who belong to his dear Son.

to the praise of the glory of his grace that he bestowed on us in the beloved,

To the praise of the glory of his grace, wherein he hath made us accepted in the beloved.

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