think sometimes we get the idea that God only works on a cosmic scale. And indeed, He is a big God who does really big things. But, if you'll think about the narrative of the whole Bible, so much of it is comprised of stories that involve God's interaction with individuals. In Jeremiah 45, for example, we have an account of God, who had been issuing prophecies aimed at nations and empires, suddenly sending a prophecy that was directed specifically at Jeremiah's personal secretary. The same God, who is known as the Lord of hosts (armies), is also known as the God of Abraham, Isaac and Jacob.
Jeremiah's secretary, Baruch, had been applying himself to the task of recording his master's enormously important prophecies. As he recorded one thundering providential threat after another, he became increasingly concerned about his own plight. But his angst was actually unnecessary. God was watching out for him. God had a good plan which was designed specifically for Baruch. He had no cause for worry or fear.
There are really two practical lessons which we can learn from this passage. On the one hand, it is important to take notice of the fact that God reminded this administrative assistant not to seek great things for himself. On the other hand, it is refreshing to realize that God had a plan for this one small man. God is a God of individuals.