This message argues that while Jesus affirms in Gospel of Matthew 4:10 that God alone is worthy of worship, Scripture also shows that not all worship is accepted: as warned in Matthew 7:21-23, only those who truly do the Father's will—rather than merely professing faith—are received. Using the account of Cain and Abel in Genesis 4, it contends that God rejected Cain not for the type of offering but for his unrighteous heart and deeds, while Abel's "more excellent sacrifice" Hebrews 11:4) reflected genuine faith and obedience. True worship, therefore, must be offered "in spirit and truth" (John 4:23-24), requiring continual submission to God's Spirit, repentance, and a pure heart free of hypocrisy. Without this inward alignment—regardless of outward practice—worship becomes empty and is rejected; but through transformation, self-examination, and faithful obedience, believers may present themselves as living sacrifices acceptable to God.