John Gill Commentary Psalms 29:4

"The voice of Jehovah is powerful; The voice of Jehovah is full of majesty." — Psalms 29:4 (ASV)

The voice of the Lord [is] powerful
Or "with power" ^F1 ; as thunder, in the effect of it, shows; and so is the Gospel, when it comes, not in word only, but is attended with the power of God to the conversion and salvation of souls; it is then quick and powerful, (Hebrews 4:12); and the word of Christ personal, when here on earth, was with power, (Luke 4:32);

the voice of the Lord [is] full of majesty ;
Christ, in his state of humiliation, spoke and taught as one having authority; and now, in the ministration of his Gospel by his servants, he goes forth with glory and majesty, (Psalms 45:3Psalms 45:4) .

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FOOTNOTES:

• F1: (xkb) "in potentia", Pagninus, Montanus; "cum potentia", Cocceius, Michaelis; "with able power", Ainsworth.