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 31:27-28
27
Behold, the days come, says Yahweh, that I will sow the house of Israel and the house of Judah with the seed of man, and with the seed of animal.
28
It shall happen that, like as I have watched over them to pluck up and to break down and to overthrow and to destroy and to afflict, so will I watch over them to build and to plant, says Yahweh.
