Daniel 7:15 (BSB)

I, Daniel, was grieved in my spirit, and the visions in my mind alarmed me.

From Daniel 7. Also in the ESV.

Commentary on Daniel 7:15

• John Calvin (Reformed), Calvin's Commentaries on Daniel 7:15: Daniel says, his spirit was either cut off or vanished, as if he suffered some mental deficiency. In this way God wished to communicate to his servant the magnitude of the vision. And he inspires us also with reverence for this vision, lest we should treat it coldly and commonly.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Daniel 7:15-28: Here we have, I. The deep impressions which these visions made upon the prophet. God in them put honour upon him, and gave him satisfaction, yet not without a great allay of pain and perplexity (Dan 7:15): I Daniel was grieved in my spirit, in the midst of my body.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Daniel 7:15: I Daniel was grieved in my spirit in the midst of my body,.... Or "sheath" (a); the soul being in the body as a sword in its scabbard; where it was "cut" (b) and pierced, as the word signifies; and was wounded, distressed, and grieved at the vision seen; not at the sight of the Son of man, and the glorious and everlasting kingdom given...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Daniel 7:15: body--literally, "sheath": the body being the "sheath" of the soul.