The Apostle Paul
Ephesians 1:6BSB·traditional attribution

to the praise of His glorious grace, which He has freely given us in the Beloved One.

Matthew Henry Presbyterian @wholebiblehenry

He begins with thanksgivings and praise, and enlarges with a great deal of fluency and copiousness of affection upon the exceedingly great and precious benefits which we enjoy by Jesus Christ. For the great privileges of our religion are very aptly recounted and enlarged upon in our praises to God. I.

Commenting on Ephesians 1:3-14

John Gill Reformed Baptist @doctorgill

To the praise of the glory of his grace,.... The grace of God manifestly appears in the predestination of men to adoption; in that God had no need of sons, he having a dear and well beloved one; in whom he is well pleased; and in that those he adopts are so unworthy of the relation; and in that men, and not angels, should be...

Albert Barnes Presbyterian @notesbybarnes

Verse 6. To the praise of the glory of his grace. This is a Hebraism, and means the same as "to his glorious grace." The object was to excite thanksgiving for his glorious grace manifested in electing love. The real tendency of the doctrine, in minds that are properly affected, is not to excite opposition to God, or to lead to the charge of partiality...