Charles Spurgeon Commentary John 3:33-34

"He that hath received his witness hath set his seal to [this], that God is true. For he whom God hath sent speaketh the words of God: for he giveth not the Spirit by measure." — John 3:33-34 (ASV)

He that hath received his testimony hath set to his seal that God is true. For he whom God hath sent speaketh the words of God: for God giveth not the Spirit by measure unto him (John 3:33–34).

There is an infinite spiritual power about the words of Christ; they are the words of God, and the Holy Spirit concentrates all his energy in those words.