Arcana Coelestia # 3119
3119. 'And he said, Blessed be Jehovah, the God of my master Abraham' means from the Divine itself and the Divine Human. This is clear from what has been stated above in 3061, where the same words occur with the exception of 'Blessed'. 'Blessed be Jehovah' was an expression of thanksgiving, and thus also of joy and gladness, that things had turned out as one wished. In addition, as to what the ancients meant by blessing Jehovah, see 1096, 1422.
Comfort
When the Bible talks about someone being comforted or consoled, it generally means that they are being offered ideas that will help bring them to a more peaceful spiritual state, whether it is a new state or the restoration of one that had been under attack. It's interesting; we tend to think of comforting someone as an emotional thing, offering our own feelings to help them feel better. But the Writings say that the spiritual meaning of 'comfort' is actually more intellectual, coming when a person gains new true ideas.
In Genesis 5:29, this signifies doctrine whereby what was perverted may be restored. (Arcana Coelestia 531)
In Genesis 27:42, this signifies intent to invert the current spiritual state.