In Genesis 18:7, this signifies natural good which here is called tender from the truth of good. (Arcana Coelestia 2180)

In Hosea 14:2, the calves of the lips signify confessions from the affection of truth.

(References: Apocalypse Revealed 242)

Jeremiah represents the Lord. (Arcana Coelestia 2838[2]).

In Jeremiah 13:7, Jeremiah here signifies the state of the church. (Divine Love and Wisdom 15[4]).

In Jeremiah 38:6, his representation is that same as Joseph's when he was thrown into the pit by his brothers -- that divine truths were rejected by falsities. (Arcana Coelestia 4728).

(References: Arcana Coelestia 2838 [1-4], 4728 [1-8]; Divine Love and Wisdom 15; Jeremiah 1:1)