The Enlightenment was an extension of many of the ideas of the renaissance and reformation.
The first element of this is religious. The reformation and the rise of Protestantism broke the stranglehold of the Roman Catholic Church on Europe. Protestantism was inherently anticlerical, arguing for the importance of scripture and personal faith in salvation was exclusively mediated by church ritual and hierarchy.
Answer:
He is writing to all the pilgrims telling them that they have to do work to get the freedom they want for themselves
The message that he was trying to get across to everybody, was that they were strong enough and capable enough to break free from England all together. Also, he was making it clear to the king of England that the new people of United states were not afraid to break free. His whole goal was to persuade the people that they should break free because, for one, the king was already taxing them to death, and two, the king still had control over them and he still had their loyalty even though they left. He wanted to make them realize how important it was for them to try to break free of Europe's control and to officially make the United States of America.
I hope this helps you. :)