The Lord will fight for you; you need only to be still. -Exodus 14:14
When the Israelites were fearful of the Egyptians coming after them to destroy them, Moses said: “Do not be afraid. Stand firm and you will see the deliverance the Lord will bring you today..." (Exodus 14:13). The Israelites were to simply do as God asked, and He would make His name known and fight for them. They needed only to be still and let God work. It doesn't mean to literally do nothing in a given situation but to let God work and obey Him. This is still true for us today! God calls us to surrender to Him and let Him work in and through us.