For I, beholde, I this day haue made thee a defenced citie, and an yron pillar and walles of brasse against the whole lande, against the Kings of Iudah, and against the princes thereof, against the Priestes thereof and against the people of the lande.
Jeremiah 1:16 And I will declare vnto them my iudgements touching all the wickednesse of them that haue forsaken me, and haue burnt incense vnto other gods, and worshipped the workes of their owne handes.
Jeremiah 1:17 Thou therefore trusse vp thy loynes, and arise and speake vnto them all that I commaund thee: be not afraide of their faces, lest I destroy thee before them.
Jeremiah 1:18 For I, beholde, I this day haue made thee a defenced citie, and an yron pillar and walles of brasse against the whole lande, against the Kings of Iudah, and against the princes thereof, against the Priestes thereof and against the people of the lande.
Jeremiah 1:19 For they shall fight against thee, but they shall not preuaile against thee: for I am with thee to deliuer thee, sayth the Lord.
The verse centers on "beholde", "haue", "thee", "defenced", "citie", "yron", "pillar", and "walles". It is saying that the verse draws attention to "beholde" and "haue", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 17's "Thou therefore trusse vp thy loynes and..." into verse 19's "For they shall fight against thee but...", so "beholde" and "haue" belong inside that flow. In Jeremiah context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "beholde" and "haue" with trust shaped by these words, not by a vague optimism outside the passage.