A Biblical Answer
To ask how a Christian should live is really to ask what it means to belong to Jesus down to the smallest details of an ordinary day. The Christian life begins not with a list of rules but with a new heart given by God and a love that responds to His love. Paul gathers it all into one tender appeal: "I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service. And be not conformed to this world: but be ye transformed by the renewing of your mind" (Romans 12:1-2). Notice the order. First the mercies of God, then our response. We do not live well in order to be loved; we live well because we are loved, and that love reshapes everything we are.
At the very center stands love, for Jesus made it the badge of His disciples: "By this shall all men know that ye are my disciples, if ye have love one to another" (John 13:35). When asked which commandment was greatest, He answered with two that cannot be separated: love God with everything you are, and love your neighbour as yourself (Matthew 22:37-39). This love shows itself less as a passing feeling and more as a settled way of life. It forgives the one who wronged us, tells the truth gently, shares bread with the hungry, and is patient when patience is hard. Such a life does not grow from sheer willpower. It is the fruit of God's Spirit working within us: "love, joy, peace, longsuffering, gentleness, goodness, faith, meekness, temperance" (Galatians 5:22-23). Where these grow, you are watching a real Christian life take shape.
A Christian is also called to holiness, which simply means belonging wholly to God and letting that show. "But as he which hath called you is holy, so be ye holy in all manner of conversation; Because it is written, Be ye holy; for I am holy" (1 Peter 1:15-16). This is a glad turning away from what wounds us and others, and a turning toward the One who is good beyond measure. It means laying aside old habits "and that ye put on the new man, which after God is created in righteousness and true holiness" (Ephesians 4:24). The God who saves us by His grace does not leave us where He found us; He works in us until our outward life begins to match the new heart He has given.
Such a life is meant to be lived honestly and humbly in the world, not hidden away from it. The prophet's summary still rings clear: "He hath shewed thee, O man, what is good; and what doth the LORD require of thee, but to do justly, and to love mercy, and to walk humbly with thy God?" (Micah 6:8). This shapes how we work, how we treat the people under our roof, how we handle money, and how we speak when no one important is listening. "And whatsoever ye do in word or deed, do all in the name of the Lord Jesus" (Colossians 3:17). The body God gave you and the daily tasks before you are not obstacles to the holy life; they are its very classroom, for God Himself called His creation good and meant for us to honour Him in it.
We should be honest that this calling is too high for us to carry alone, and God never asks us to. Jesus said, "Abide in me, and I in you. As the branch cannot bear fruit of itself, except it abide in the vine; no more can ye, except ye abide in me" (John 15:4). The Christian who tries to be good apart from Christ will only grow weary; the one who stays near Him bears fruit without straining. So we keep returning to Him: in the Scriptures where He speaks, in prayer where we answer, in the gathered fellowship of believers where we are encouraged and held accountable, and in quiet daily obedience. We will stumble, and when we do, we come back to the mercy that welcomed us at the first. This calling draws us not into a heavy religion of fear but into a real and growing friendship with the living God.
Finally, the Christian life looks outward. Every believer is "an ambassador for Christ" (2 Corinthians 5:20), sent to carry His love into a hurting world by both word and deed. We share the good news, serve the people God places near us, and let our lives quietly point beyond ourselves: "Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven" (Matthew 5:16). To live as a Christian, then, is to walk through ordinary days with Jesus, growing more like Him, leaning on His Spirit, and loving the people He loves, until the love we have received finally overflows to everyone around us.