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.
Arcana Coelestia # 2902
2902. Divine truth breathing its last is described in verses 1-3, and the Lord's establishment of a new Church in verse 4. He was received kindly, verses 5-6, and this gave rise to joy, verses 7, 12. Their first state was one of obscurity when they believed that the good which flows from charity, and the truth of faith, originated in themselves, verses 8-11, 14-15. But they were taught that good and truth did not originate in themselves but in the Lord, verse 13. In this way they were redeemed, verse 16, and regenerated, verses 17-18. Thus a new Church was formed, verse 19, from gentiles, verse 20.