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 26:1-2
1
In the beginning of the reign of Jehoiakim the son of Josiah, king of Judah, came this word from Yahweh, saying,
2
Thus says Yahweh: Stand in the court of Yahweh's house, and speak to all the cities of Judah, which come to worship in Yahweh's house, all the words that I command you to speak to them; don't diminish a word.
