Jeremiah Chapter 51 verse fourteen

"The Lord of Hosts hath sworn by himself, saying, surely I will fill thee with men, as with caterpillars, and they shall lift up a shout against thee". From here on out, the entire flow of these passages kicks into a higher gear. A passion flows from our God that we should all take very seriously. In fact, all of the pleading, all of the passionate prose we see in scripture as God deals with His people, Israel, should be taken to heart by His people, the Church. For through his prophets, he would speak to us exactly the same way, if we'll listen. Yes, in these passages in Jeremiah, God is crying out to us today as much as he was to them. He is crying out to us with the same passion Jesus has on the last day of the feast. Till now, much of the word against Babylon has been "the Lord hath" or "the Lord will", here, the prophet switches to first person - "I will fill thee with men". This has happened to me while prophesying. There is a high level of passion here. God is becoming very emotional, exposing his heart, speaking from his heart to us, not just his mind. What we do on behalf of the Lord must also come from our hearts, not just our minds or we'll end up with religion. We must respond to his passion for us with as much passion of our own directed back to him. He calls us to love him with all our hearts, minds, souls and strength because this is exactly how he loves us!
I've seen churches in dead denominations that were very much alive because they were sincerely serving the Lord with all their hearts and I've seen churches that appeared to be alive, but were only going through the motions outwardly, mimicking the Holy Spirit with no real presence. The heart is the key. In scripture, there are 957 mentions of the heart, while the mind is mentioned only 137 times. The priority is "Love the Lord thy God with all thy heart" (Dt:6:5), then the mind, soul and strength. It's spirit, soul then body. If our hearts do not belong to him, if our spirits aren't walking with him, we will end up with "religion". So we can say, religion is the false pursuit of God with man's mind and not his heart. This is one definition. This is why religious christians are forever getting into debates with each other about doctrine. Truthfully, it isn't our place to determine sound doctrine, only the Holy Spirit can do that. Those submitted to him will recognize his voice in teachings they hear, those not submitted to him won't and will argue instead. They are forever discussing doctrine, elevating doctrines even above God himself. Jesus couldn't even teach the Pharisees because they were convinced in their pride that they knew better than God. It is because all they can do in their approach to God is know him soulishly, not spiritually. They can even get emotional about God occasionally but they never stop eating from the tree of the knowledge of good and evil. Knowledge about God is all they have to go on. They are carnally minded when their hearts do not belong to him because if they did they would not reject him when he comes to them in the form of the Holy Spirit, or in the form of an apostle or prophet, or even as a Jew.
Another note from Jeremiah 51:14 is that God swears by himself. This is very for indeed, he can swear by no one higher. He actually swears an oath that he must fulfill, so serious is he about judging and destroying Babylon. There can be no inteceding on her behalf at this point, it's too late for that. Would to God we his people would also become this serious about fleeing Babylon, then exposing and prophesying against her. Especially now that the battle has begun. Then, in verses 15 & 16, he gives his credentials, not that he needs to prove himself to us or anyone but out of mercy for us...