The word "worship" is derived from the Old English word "weorthscipe": to grant worth to an object or a person. You may ascribe Jesus Christ His due worth-ship (worship) using any of the above expressions, but those expressions are not in and of themselves worship. Jesus is inherently worthy, therefore when we demonstrate His worthy-ness, we are merely agreeing with a fixed reality, an irreversible truth.
Jesus told a Samaritan woman, "You worship what you do not know; we worship what we know, for salvation is from the Jews" (John 4:22 NASB). The Greek word proskuneite (worship) translates "to kiss, like a dog licking his master's hand; to fawn or crouch to, i.e. (literal or figurative) prostrate oneself in homage (do reverence to, adore): -- worship.1 BDAG states that its frequent use was the designation and custom of one prostrating himself "before persons and kissing their feet or the hem of their garment, the ground, etc.; the Persians did this in the presence of their deified king, and the Greeks before a divinity or something holy."2
We find the expression of kissing the feet of Jesus at Psalm 2: "Kiss the Son, lest He be angry, and you perish in the way" (Ps. 2:12 NKJV; cf. also KJV, ESV, NIV, ISV); "Do homage to the Son, that He not become angry, and you perish in the way" (Ps. 2:12 NASB; cf. also NET). The Septuagint (i.e., Greek version of the Hebrew Old Testament) uses a different Greek word here for kiss, than for worship, but the image remains.
What if an individual acknowledges God's right to worthship (worship) but lives his life in a perverse or unworthy manner? Will his acknowledgment -- his worship of God through Christ Jesus -- be counted as genuine? You can probably guess by the way the question is asked that the answer is no. But why is the answer no? If the man or woman is worshiping -- in other words, acknowledging that God is inherently worthy -- why must the individual also live a worthy life?
Husbands, imagine if your wife thought you were the most handsome man on earth, with the most impeccable integrity among all other men, and she acknowledged (at least once a week, say Sundays) that you were worthy of that claim. Sundays would probably become your favorite day of the week! However, let's say that Monday through Saturday, she would flirt with every other man with whom she encountered, held private meetings with some of those men, dressed in such a way as to always attract men, and never spoke of you or your worth to anyone else she met. What would you think of her acknowledging your "worthiness" on Sundays?
I was taught by some Pentecostals that to worship God "in spirit and in truth" (John 4:24) meant to "give Him all I had" during the Sunday "worship time" (which, typically, meant during the singing portion of the service). "Giving Him all I had" was interpreted to mean lifting my hands in praise, clapping my hands in praise, singing in tongues in the Spirit to Jesus, and allowing the Holy Spirit to do whatever He wanted to do in me, which was not limited to those few expressions. This, I discovered, is not worshiping God in spirit and in truth.
The apostle Paul wrote to one congregation: "Brethren, join in following my example, and observe those who walk according to the pattern you have in us. For many walk, of whom I often told you, and now tell you even weeping, that they are enemies of the cross of Christ, whose end is destruction, whose god is their appetite, and whose glory is in their shame, who set their minds on earthly things" (Phil. 3:17-19 NASB).
Note that Paul was not bothered by their expressions in the worship service. What disturbed him profoundly -- what should disturb us all profoundly -- was that in their congregation were professing believers who did not "walk the walk." In other words, they said one thing in their speech and in their worship, but they lived their lives completely contrary to their profession. Like the wife pictured above, they acknowledged God's worthiness during worship, but they conducted their lives during the rest of the week as though God did not exist. These "believers" are functional atheists.
Life is worship. We do not worship God only on Sundays. Those types of people are called "nominal Christians." That means that such people are "Christian" in name only. But that name is a useless title, void of any real or genuine significance. Scripture teaches, "Whether, then, you eat or drink or whatever you do, do all to the glory of God" (1 Cor. 10:31); "Whatever you do in word or deed, do all in the name of the Lord Jesus, giving thanks through Him to God the Father" (Col. 3:17).
Even eating a meal or a snack -- even drinking a soda or water or juice -- even studying for school or taking a test or performing on your job or going to the bank or walking through the park or burping your baby -- do all to the glory of God. Worship is not about momentary expressions (raising or clapping your hands while you sing praise choruses). Worship is not about the style of music you prefer. Worship is not one hour on a Sunday morning. Life is worship. If you claim to "worship" God, then the manner in which you conduct your life will reflect the truth of that claim.
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1 AMG's Annotated Strong's Greek Dictionary, in Strong's Complete Word Study Concordance, expanded edition, ed. Warren Baker (Chattanooga: AMG Publishers, 2004), 2145.
2 A Greek-English Lexicon of the New Testament and other Early Christian Literature, third edition, BDAG, revised and edited by Frederick William Danker (Chicago: The University of Chicago Press, 2000), 882.