Jesus said that when we receive the Holy Spirit, we receive power (see Acts 1:8). Why have we been given this power? To speak against sin and be witnesses to Jesus’ saving grace. We are to declare to the world the Law that God gave to Moses, which measures how all have sinned against God. Sin cannot be understood in truth until we realize that we are transgressors (see Rom. 7:7; 1 John 3:4). Any knowledge of sin, without the light of God’s Law, will be shallow. It is God’s Law that shows sin to be exceedingly sinful (see Rom. 7:13).
But truly I am full of power by the Spirit of the Lord,
And of justice and might,
To declare to Jacob his transgression
And to Israel his sin.