God is spirit, and those who worship him must worship in spirit and truth."
The verse before us is a powerful prohibition.  Also, Jesus said, "In vain do they worship me, teaching for doctrines the commandments of men" (Mark 7:7).  An apostle declared that "God ... dwelleth not in temples made with hands; neither is worshipped with men's hands, as though he needed anything" (Acts 17:24,25).  The author of this gospel wrote, "Testify unto every man that heareth the prophecy of this book, if any man shall add unto these things, God shall add unto him the plagues that are written in this book"  (Revelation 22:18).  And also, "Whosoever transgresseth, and abideth not in the doctrine of Christ, hath not God" (2 John 1:1:9).  Jesus said of the Pharisees, "Ye have made the commandment of God of none effect by your tradition"  (Matthew 15:6).  Paul warned the Corinthians, "Now these things, brethren, I have in a figure, transferred to myself and Apollos for your sakes; that in us ye might learn not to go beyond the things which are written"  (1 Corinthians 4:6).  From these specific prohibitions, as well as from the spirit and tenor of the entire Bible, it is clearly impossible for man to approach his Creator in worship, except as God has directed.  This was true in the days of Cain and Abel, of Nadab and Abihu, of David and Uzzah, and of the Lord Jesus Christ and ever afterward.  It is true now and always.