“But an hour is coming, and now is, when the true worshipers will worship the Father in spirit and truth; for such people the Father seeks to be His worshipers.” (John 4:23)

This is the same “hour is coming” Jesus had just mentioned in :21, when He said that worship is not a matter of geography: “Neither in this mountain nor in Jerusalem.” He completes that idea by indicating true worship must be “in spirit and truth.” 
“In spirit and truth.” (Greek: en pneumati kai alytheia). Significantly, it does NOT read “in spirit and IN truth”, as though these were two separate things, but “in spirit and truth” both with one article, indicating that they are one; indivisible.

Thus an important lesson: SPIRIT AND TRUTH GO TOGETHER IN WORSHIP. It is not as though you can worship “in spirit” and omit the truth. No matter how fervently or emotional your worship is, if you are worshipping outside the realm of truth, you are not truly worshipping God in spirit either.

And it is not as though you can worship in truth, without worshipping in spirit either. It must be from your heart to be acceptable to the Lord. Jesus said that genuine worship must be BOTH “in spirit and truth.” They are inseparable. Do you want your worship of God to be more than a mere ritual, but truly acceptable to Him?  Then Jesus said your worship must be both “in spirit and truth.”