The child of God is one who walks, not in his own righteousness, but in the righteousness of the Lord.
"For He [God] made Him [Jesus] who knew no sin to be sin for us, that we might become the righteousness of God in Him" 2 Corinthians 5:21
The Hebrew word for 'righteousness' refers to prosperity.
The one who walks in the righteousness of the Lord prospers in the Lord.
That is why no weapon of the enemy can prosper against us.
It cannot stand up against the prosperity of God.