What God expects of Christians is made clear throughout the NT. Nearly forty exhortations appear in Rom. 12 alone. The apostolic creed found in Tit. 2:11-14 outlines the Christian life as the denial of ungodliness and worldly lusts, accompanied by self restraint, righteousness, godliness and the expectation of the return of Christ. Another such outline in Heb. 10:19-25 calls for prayer, public testimony, a good example to others and assembly for worship.
It is reasonable, or spiritual, RV, to present one’s body to God as a living sacrifice to serve Him, Rom. 12:1. This service must be exclusive, Luke 16:13; given with the spirit, Rom. 1:9; rendered with reverence and godly fear, Heb. 12:28; motivated by love.
Gal. 5:13. It calls for following Christ, John 12:26, whom all Christians serve, Col. 3:24, as they serve God, Acts 27:23.
Believers are described as persons who have turned to God from idols to serve the living and true God, 1 Thess. 1:9. This service may take the form of fasting and prayer, Luke 2:37, or ministering to the poor and needy, or giving oneself to prayer and the ministry of the Word as did the apostles, Acts 6:1-4.
When Christian service is rendered in righteousness, peace, and joy, the believer is acceptable to God and approved of men, Rom. 14:17, 18.
William Evans, The Great Doctrines of the Bible, (Chicago: Bible Institute Colportage Assoc., 1912), WORDsearch CROSS e-book, 315-316.
AMEN & AMEN.