Power of the Holy Spirit within us.
From the Bible:
Then Joshua got up early in the morning; and he and all the sons of Israel set out from Shittim and came to the Jordan, and they spent the night there before they crossed. 2 Then at the end of three days the officers went through the midst of the camp; 3 and they commanded the people, saying, “When you see the ark of the covenant of the Lord your God with the Levitical priests carrying it, then you shall set out from your place and go after it. 4 However, there shall be a distance between you and it of about two thousand cubits by measurement. Do not come near it, so that you may know the way by which you shall go, for you have not passed this way before.”
5 Then Joshua said to the people, “Consecrate yourselves, for tomorrow the Lord will do miracles among you.” 6 And Joshua spoke to the priests, saying, “Take up the ark of the covenant and cross over ahead of the people.” So they took up the ark of the covenant and went ahead of the people.