This has been an important topic for me lately - this is 1 of 2 postings on the subject and some insights I have had into what it really means to worship in spirit and truth..... comments are welcomed.....
John 4:23-24 "But the hour is coming, and now is, when true worshippers will worship the Father in spirit and in truth, for the Father is seeking such to worship Him. God is Spirit and they that worship Him must worship Him in spirit and in truth."
Worshipping God in spirit means it must be done from the heart. "Therefore, I urge you, brothers, in view of God's mercy, to offer your bodies as living sacrifices, holy and pleasing to God—this is your spiritual act of worship." (Romans 12:1)
Worshipping God in truth means that it must be God centered. He commands our worship and He deserves it. "Oh come, let us sing to the Lord! Let us shout joyfully to the Rock of our salvation. Let us come before His presence with thanksgiving; Let us shout joyfully to Him with psalms. For the Lord is the great God, And the great King above all gods. In His hand are the deep places of the earth; The heights of the hills are His also. The sea is His, for He made it; And His hands formed the dry land. Oh come, let us worship and bow down; Let us kneel before the Lord our Maker. For He is our God, And we are the people of His pasture, And the sheep of His hand." (Psalm 95)
Worship is done for God, and God's pleasure alone! Worship as an act can be anywhere, at any time, and in whatever form focuses my adoration on God.