Definition and Overview:
Strength from God refers to the divine empowerment and fortitude that believers receive from the Lord to endure trials, overcome obstacles, and fulfill His purposes. This strength is not merely physical but encompasses spiritual, emotional, and mental resilience. It is a recurring theme throughout the Bible, emphasizing reliance on God's power rather than human ability.

Biblical Foundation:
The concept of strength from God is deeply rooted in Scripture. In the Old Testament, God is often depicted as the source of strength for His people. For instance, in Psalm 28:7 , David declares, "The LORD is my strength and my shield; my heart trusts in Him, and I am helped." This verse highlights the personal and relational aspect of divine strength, where trust in God results in empowerment.

In the New Testament, the Apostle Paul frequently speaks of strength derived from God. In Philippians 4:13 , he writes, "I can do all things through Christ who gives me strength." This verse underscores the sufficiency of Christ's power in enabling believers to face all circumstances.

Old Testament Examples:
1. Samson: One of the most notable examples of God-given strength is Samson, whose physical prowess was a direct result of the Spirit of the Lord coming upon him (Judges 14:6). Despite his personal failings, Samson's strength was a testament to God's power working through an individual.

2. David: King David frequently acknowledged God as his source of strength. In 1 Samuel 30:6 , during a time of great distress, "David found strength in the LORD his God." This reliance on divine strength was a hallmark of David's leadership and faith.

3. Isaiah's Prophecy: The prophet Isaiah speaks of renewed strength for those who wait on the Lord. Isaiah 40:31 promises, "But those who wait upon the LORD will renew their strength; they will mount up with wings like eagles; they will run and not grow weary, they will walk and not faint."

New Testament Teachings:
1. Jesus Christ: Jesus Himself is the ultimate source of strength for believers. In John 15:5 , He states, "I am the vine; you are the branches. The one who remains in Me, and I in him, will bear much fruit. For apart from Me you can do nothing." This metaphor illustrates the necessity of abiding in Christ to receive His strength.

2. Paul's Epistles: The Apostle Paul often writes about the strength that comes from God. In Ephesians 6:10 , he exhorts believers, "Finally, be strong in the Lord and in His mighty power." This call to strength is linked to the spiritual armor of God, emphasizing the need for divine empowerment in spiritual warfare.

3. The Holy Spirit: The indwelling of the Holy Spirit is a source of strength for believers. In Acts 1:8 , Jesus promises, "But you will receive power when the Holy Spirit comes upon you; and you will be My witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth." The Holy Spirit empowers believers for witness and service.

Practical Implications:
Believers are encouraged to seek God's strength through prayer, Scripture, and reliance on the Holy Spirit. This divine strength enables them to persevere through trials, resist temptation, and carry out God's will. It is a reminder that human weakness is an opportunity for God's power to be made perfect (2 Corinthians 12:9).

Conclusion:
Strength from God is a vital aspect of the Christian life, providing believers with the necessary power to live victoriously and fulfill their divine calling. Through faith and dependence on God, believers can access this strength and experience His sustaining grace in every aspect of life.