Verse 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.

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.

Verse 5

And seekest thou great things for thyself? seek them not: for, behold, I will bring evil upon all flesh, saith the LORD: but thy life will I give unto thee for a prey in all places whither thou goest.

Seek them not — Dost thou expect what none is like to meet with who feareth God? Upon all flesh - I am bringing calamities upon the whole nation.