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.
Sons of thunder
In Mark 3:17, as James and John were called, refer to the fact that they represent charity and its works, from which comes all the perception of truth and good. (Apocalypse Revealed 236[2])
(参照: Apocalypse Explained 821; Mark 3)