I find no rest — Upon Baruch's reading the prophecies both he and Jeremiah were advised to hide themselves. This probably disturbed Baruch, and made him lament his condition.
Related Commentaries of Jeremiah 45:3
Jeremiah 45:3
3 Thou didst say, Woe is me now! for the LORD hath added grief to my sorrow; I fainted in my sighing, and I find no rest.