Definition and Concept
The concept of "daily death" in Christian theology often refers to the spiritual practice of dying to oneself, which involves the continual surrender of personal desires and sinful inclinations in favor of living a life that is aligned with the teachings and example of Jesus Christ. This practice is rooted in the call to discipleship and sanctification, where believers are encouraged to live a life that reflects the character and will of God.

Biblical Foundation
The idea of daily death is primarily derived from the teachings of the Apostle Paul, who frequently used the metaphor of dying to describe the Christian's transformation and sanctification process. In 1 Corinthians 15:31, Paul states, "I face death every day, brothers, as surely as I boast about you in Christ Jesus our Lord." Here, Paul emphasizes the daily nature of this spiritual discipline, highlighting the ongoing struggle against sin and the commitment to live for Christ.

In Romans 6:6-7, Paul further explains, "We know that our old self was crucified with Him so that the body of sin might be rendered powerless, that we should no longer be slaves to sin. For anyone who has died has been freed from sin." This passage underscores the believer's identification with the death of Christ, which empowers them to overcome sin and live a new life in righteousness.

Theological Implications
Daily death is closely associated with the doctrine of sanctification, which is the process of becoming more like Christ through the work of the Holy Spirit. It involves a conscious and deliberate effort to put to death the deeds of the flesh, as described in Colossians 3:5: "Put to death, therefore, the components of your earthly nature: sexual immorality, impurity, lust, evil desires, and greed, which is idolatry."

This practice is not merely about self-denial but is a transformative process that leads to spiritual growth and maturity. It requires believers to take up their cross daily, as Jesus instructed in Luke 9:23: "Then He said to all of them, 'If anyone would come after Me, he must deny himself and take up his cross daily and follow Me.'"

Practical Application
In practical terms, daily death involves regular self-examination, repentance, and a commitment to live according to God's Word. It is a daily decision to reject sinful behaviors and attitudes and to cultivate the fruits of the Spirit, such as love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, and self-control (Galatians 5:22-23).

Believers are encouraged to rely on the Holy Spirit for strength and guidance in this endeavor, as it is not achievable through human effort alone. Prayer, meditation on Scripture, and participation in the life of the church community are essential practices that support the believer in this journey of daily dying to self and living for Christ.

Historical and Contemporary Perspectives
Throughout church history, many Christian writers and theologians have emphasized the importance of daily death in the believer's life. Early church fathers, such as Augustine and John Chrysostom, wrote extensively on the need for Christians to die to their own desires and live for God. In more recent times, authors like Dietrich Bonhoeffer and A.W. Tozer have reiterated the significance of this spiritual discipline in the pursuit of holiness and authentic Christian living.

In contemporary Christian practice, the concept of daily death continues to be a vital aspect of discipleship and spiritual formation. It challenges believers to live counter-culturally, prioritizing God's kingdom over personal ambitions and societal norms.