Definition:
Eternal Focus refers to the mindset and spiritual discipline of prioritizing eternal, heavenly matters over temporal, earthly concerns. It involves aligning one's thoughts, actions, and life purpose with the eternal truths and promises found in Scripture, emphasizing the significance of the eternal life promised through faith in Jesus Christ.

Biblical Foundation:
The concept of Eternal Focus is deeply rooted in the teachings of the Bible, where believers are encouraged to set their minds on things above and to live in light of eternity. This focus is a call to live with an awareness of the eternal consequences of one's actions and decisions.

Key Scriptures:

1. Colossians 3:1-2 :
"Therefore, since you have been raised with Christ, strive for the things above, where Christ is seated at the right hand of God. Set your minds on things above, not on earthly things."

This passage exhorts believers to direct their thoughts and desires toward heavenly realities, emphasizing the importance of a Christ-centered life that transcends earthly distractions.

2. 2 Corinthians 4:17-18 :
"For our light and momentary affliction is producing for us an eternal glory that is far beyond comparison. So we fix our eyes not on what is seen, but on what is unseen. For what is seen is temporary, but what is unseen is eternal."

Here, the Apostle Paul contrasts the temporary nature of earthly struggles with the eternal glory that awaits believers, encouraging a focus on the unseen and eternal.

3. Matthew 6:19-21 :
"Do not store up for yourselves treasures on earth, where moth and rust destroy, and where thieves break in and steal. But store up for yourselves treasures in heaven, where moth and rust do not destroy, and where thieves do not break in and steal. For where your treasure is, there your heart will be also."

Jesus teaches the importance of investing in eternal treasures, highlighting the connection between one's focus and the condition of the heart.

Theological Implications:
Eternal Focus is a transformative perspective that affects every aspect of a believer's life. It calls for a reorientation of values, priorities, and goals, urging Christians to live with an awareness of God's eternal kingdom. This focus fosters spiritual growth, resilience in trials, and a deeper relationship with God.

Practical Application:
1. Prayer and Meditation: Regular prayer and meditation on Scripture help believers maintain an eternal perspective, drawing their hearts and minds toward God's eternal truths.

2. Service and Stewardship: Engaging in acts of service and wise stewardship of resources reflects a commitment to eternal values, as believers invest in God's kingdom work.

3. Community and Fellowship: Participating in a community of faith provides encouragement and accountability, helping believers to keep their focus on eternal matters.

4. Witness and Evangelism: Sharing the gospel with others is a natural outflow of an eternal focus, as believers seek to impact the eternal destinies of those around them.

Challenges to Eternal Focus:
The temporal nature of the world presents numerous distractions and challenges to maintaining an eternal focus. Materialism, cultural pressures, and personal ambitions can divert attention from eternal priorities. Believers are called to remain vigilant and intentional in cultivating an eternal mindset, relying on the Holy Spirit for guidance and strength.

Conclusion:
Eternal Focus is a vital aspect of the Christian life, shaping how believers view the world and their place in it. By setting their minds on things above, Christians are empowered to live purposefully and joyfully, anticipating the fulfillment of God's eternal promises.