This is the corresponding Psalm for the wedding at Cana where Christ turned water into wine. The first of His recorded miracles. The main purpose of any miracle is to point to Christ's divinity. God is the author of creation and the laws of nature. When He sets aside these laws--man views it as a miracle--to teach of His power and love. Creation itself shouts of God's power. At walled Jericho the inhabitants feared the Israelites. The city had heard what God did forty years earlier at the parting of the Red Sea and now parting the nearby Jordan river. God's power is scary to sinners. We know that power also includes full redemption (God's love). Many seek to hide from punishment by denying God's power / authority. There is no punishment for those in Christ.
Psalm 66:5ff
5Come and see the works of God,
Who is awesome in His deeds toward the sons of men.
6He turned the sea into dry land;
They passed through the river on foot;
come, let us rejoice in Him!
7He rules by His might forever;
His eyes keep watch on the nations;
Let not the rebellious exalt themselves.
9Who keeps us in life
And does not allow our feet to slip.
10For You have tried us, O God;
You have refined us as silver is refined.
16Come and hear, all who fear God,
And I will tell of what He has done for my soul.
20Blessed be God,
Who has not turned away my prayer
Nor His loving kindness from me.
v.5-6 God doesn't need our adulation, He is complete. The miracles are for man's benefit. We respond in rejoicing.
v.6 "sea"--parted it and destroyed Pharaoh's army. "river"--God parted the Jordan River as Israel finally entered the Promised Land. The daily manna stopped. Israel was home--as per God's promise.
v.9-10 "keeps", "refined"--our lives. Our spiritual lives?
v. 16 & 20. God worked for each of our souls and showed His loving kindness by suffering our hell on the cross. "me, my" evangelism is personal and specific.