Charles H. Spurgeon on Psalms 29:9

(last clause). David speaking in the former part of the Psalm of the effects of natural thunder only, towards the close of the Psalm applies it to the Word of God, while he saith, And in his temple doth every one speak of his glory; that is, the word and ordinances of God, ministered in his church or temple, will put every one to acknowledge and speak of the glorious power of God, even much more than the mighty thunder which sounds in our ears, or the subtle lightning which flashes in our eyes. There is far more royal power in the thunder of the Word, than in the word of thunder. This terrifies only to conviction, but that terrifies to salvation; for after God speaks terror there in his threatenings, he speaks comfort in the promises; and when he hath affrighted us with a sense of our sins and of his wrath due to us for our sins, as with an horrible tempest, he presently refresheth us with the gentle gales of revealed grace, and with the pleasant amiable sunshine of his favour by Jesus Christ. Joseph Caryl.