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.

7243. 'Speak to Pharaoh king of Egypt all that I speak to you' means warnings given to those who molest by means of utter falsities, warnings delivered by things that flow in from the Divine. This is clear from the meaning of 'speaking', when those steeped in falsities are the ones to be spoken to, as a warning, as above in 7120; from the representation of 'Pharaoh king of Egypt' as those who molest by means of utter falsities, dealt with in 7220, 7228; and from the meaning of 'all that I speak to you' as things that flow in from the Divine.