Speak
Like "say," the word "speak" refers to thoughts and feelings moving from our more internal spiritual levels to our more external ones -- and ultimately from the Lord, who is in a sense the most internal spiritual level of all. This is generally called "influx" and "perception" in the Writings, meaning they are thoughts and feelings that flow in in a complete way from the Lord, rather than being things we have to think about and figure out. On a number of occasions "speak" and "say" are used together; in these cases "speak" refers more to intellectual instruction in matters of thought and "say" refers more to feelings and affections that flow in directly.
Jeremiah 44:1-2
1
The word that came to Jeremiah concerning all the Jews who lived in the land of Egypt, who lived at Migdol, and at Tahpanhes, and at Memphis, and in the country of Pathros, saying,
2
Thus says Yahweh of Armies, the God of Israel: You have seen all the evil that I have brought on Jerusalem, and on all the cities of Judah; and behold, this day they are a desolation, and no man dwells therein,
