Nebuchadnezzar was a great king, who became proud of his achievements in building Babylon. God couldn’t work with him in this state, so he was forced to live like a beast in the field for 7 years. But at the end he was able to say “Now I, Nebuchadnezzar, praise and extol and honor the King of heaven, for all his works are right and his ways are just; and those who walk in pride he is able to humble.“
This is a reminder for us, that we are only unprofitable servants, at best merely doing our duty. It’s up to us to demonstrate meekness rather than pride, filling our hearts with God’s will rather than our own.