"For with stammering lips and another tongue
He will speak to this people..."
This was the Prophetical word given in the Old Testament by our Lord God to Prophet Isaiah for the coming manifestation of the Holy Spirit.
In Mark 16:17...
Ephesians 3:16-19 “I pray that out of his glorious riches he may strengthen you with power through his Spirit in your inner being, so that Christ may dwell in your hearts through faith. And I pray that you, being rooted and established in love, may have power, together with all the Lord’s holy people, to grasp how wide and long and high and deep is the love of Christ, and to know this love that surpasses knowledge—that you may be filled to the measure of all the fullness of God.”