God's past miracles are a preview of His future, even more incredible interventions.
While the verse immediately recalls the Red Sea crossing, it's not just about remembering the past. The context of Isaiah 43 is God's message of comfort and hope to the people of Israel during their exile in Babylon.
God declares in the following verses (specifically Isaiah 43:18-19), "Remember ye not the former things, neither consider the things of old. Behold, I will do a new thing; even now it shall spring forth; shall ye not know it? I will even make a way in the wilderness, and rivers in the desert."
This shows that God's power to create paths isn't a one-time event. He performed a miracle in the sea, but He's about to do something new and amazing in the wilderness and the desert. This points to the eventual return from Babylonian exile, a journey that would also require God's direct intervention to provide a way. It's a promise that God continues to make paths for His people, even when the circumstances seem barren and desolate.