The scripture Christ quoted in Matthew 22:37 is from Deuteronomy 6:5, which follows one of the most important verses in the Bible, Shema Yishrael Yahovah Elohenu Yahovah ehad, “Hear, O Israel! Yahovah our God, Yahovah is one!” Christ directs us to serve the only true God – our Father, whom the Bible teaches we must love with our entire being, as there is only one God and Father of all (cf. 1Cor. 1:8; Eph. 4:6). Therefore, we must determine who the one true God is from scripture, His relationship to Jesus Christ and all of us.
Christ said plainly that his Father is greater than he (Jn. 13:16; 14:28). This did not change after his resurrection because Christ is to return everything to the Father when he has completed the work he was sent to do (1Cor. 15:24). If Christ were equal to his Father, he would not be handing the kingdom back to Him. Christ also directed the disciples to worship his God and Father only (Mt. 6:9). To worship any other being, human or spirit, is contrary to the first commandment (Ex. 20:1-3). Therefore, singing praises or praying to Christ or other angels is against the law and will of the Father (Rev. 19:10; 22:8-9). All worship is to be directed to the Father alone (Mt. 6:8-9). As the son of God is our Mediator, we pray to the Father in the name and by the authority of Jesus Christ (Jn. 14:13) because his sacrifice, offered on our behalf, enables everyone to draw near to the one true God (Jn. 17:3).